Horse Blanket Types Explained: Turnout, Stable and Cooler

Reviewed by Dr. Ali Ehtisham, DVM

Walk into any equestrian retailer and the rug section presents an apparently bewildering array of options. Turnout rugs, stable rugs, cooler rugs, fleece rugs, fly sheets, sweet itch suits, exercise sheets — each designed for a specific purpose, available in numerous fill weights, neck designs, and fit types. For a new horse owner, the choices can feel overwhelming. For an experienced one, the temptation to over-rug — to add more rugs, heavier fills, or multiple layers — is a common welfare concern.

This guide explains each rug category clearly, covers how to measure and fit correctly, and addresses the "to rug or not to rug" question that generates more yard debate than almost any other topic in horse management. The key principle throughout is that rugging should serve the horse's actual needs — not the owner's desire to be seen caring for their horse, and not habit carried over from what was done to the previous horse. Understanding what each rug is for makes choosing the right one straightforward.

Turnout Rugs

Turnout rugs are the most purchased category of horse rug, and the one with the most variation in specification. Their defining features are a waterproof outer shell and breathable construction — the rug keeps rain off and allows sweat vapour to escape, preventing the horse from becoming wet either from external moisture or from trapped perspiration. All turnout rugs have these properties regardless of fill weight; the fill determines the level of warmth provided.

Fill Weights

Fill weight is measured in grams per square metre of hollow fibre insulation. The common categories are:

0g (Lightweight / No-Fill): A waterproof shell with no insulation. This rug keeps the horse dry and breaks the wind without adding warmth. It is ideal for mild, wet autumn days when a horse needs to stay dry but does not need additional heat. It is also appropriate for horses with a full winter coat in light rain, and for those who tend to run warm.

100g (Lightweight Fill): Provides light insulation in addition to waterproofing. Suitable for cool but not cold days, for clipped horses in autumn, or as a transitional rug when temperatures are beginning to drop but have not yet reached their winter lows.

200g (Mediumweight Fill): The workhorse of the rug category for most temperate climates. Provides meaningful warmth for temperatures from roughly 5–10°C for clipped horses or horses with fine coats. A 200g turnout will see many owners through the majority of a British winter for a partially clipped horse.

300g+ (Heavyweight Fill): Substantial insulation for very cold conditions, prolonged exposure, or horses that are clipped out and have no coat to contribute. Some products go to 400g or beyond for extreme conditions. Heavyweight rugs are not appropriate for unclipped horses in mild winter weather — they will cause overheating and sweating, which creates more welfare problems than they solve.

The decision on fill weight should be based on the horse's level of clip, breed type, individual thermoregulatory tendency, weather conditions, and access to shelter — not on a calendar date or a general rule. Monitor body condition, feel the skin under the rug regularly, and adjust layers as conditions change.

Stable Rugs

Stable rugs are designed for indoor use only. They are not waterproof and should never be used for turnout. Their construction is typically softer and lighter than a turnout rug, with a woven or quilted outer and hollow fibre fill. They perform the same insulating function as a turnout rug fill but without the robust weatherproofing shell that would be redundant indoors and would trap heat in a stable environment.

Stable rugs are used to provide warmth to stabled horses that are clipped, elderly, convalescing, or are breeds without the coat depth to maintain comfortable body temperature in cold stabling. They are also used over cooler rugs as an additional layer during warm-down periods in winter.

The same fill weight logic applies: a stable rug should be appropriate for the temperature of the stable and the horse's individual needs, not reflexively applied to every stabled horse every winter. A well-bedded stable with minimal draughts is considerably warmer than a field in wind and rain, and many horses need no stable rug at all, particularly if unclipped.

Cooler Rugs

Cooler rugs serve a specific and important purpose: managing the transition from work to rest safely and efficiently. A horse finishing work, particularly in colder weather, will have elevated body temperature, a coat that is damp from sweat, and elevated respiratory rate. If a cold, wet horse is simply untacked and put in its stable, it may become cold and uncomfortable as the sweat evaporates and takes heat with it. Cooler rugs prevent this.

The fabric used in cooler rugs works by wicking moisture away from the horse's skin and coat and transporting it to the outer surface of the rug, where it can evaporate. The horse dries relatively quickly and maintains warmth throughout the process. Wicking fabrics include polypropylene, fleece, and specialist thermal weaves. The rug is used after untacking: the horse is walked until breathing has normalised, the cooler is applied, and the horse is walked or allowed to stand until the coat is dry and body temperature has returned to normal — at which point the cooler is removed and replaced with an appropriate stable rug if needed.

Cooler rugs are not meant to be left on indefinitely. Once the horse is dry, the cooler should be removed. Leaving a cooler rug on a horse that is already dry and warm may cause overheating. Some owners combine a cooler rug and a stable rug by layering appropriately, but the cooler should always come off before the horse is settled for the night.

Fly Rugs

Fly rugs are constructed from fine mesh fabric that protects against fly irritation and UV light while allowing air circulation. They are lightweight, non-insulating, and designed for warm summer use. For horses that are severely bothered by flies — particularly those that stomp, swish constantly, lose weight from irritation, or develop skin reactions — a fly rug can transform their summer comfort significantly.

A good fly rug covers the body and, in full-specification versions, includes a neck cover and belly flap to reduce fly access. The mesh used should be fine enough to deter small insects whilst allowing reasonable airflow. Ensure the rug does not trap heat — a well-designed fly rug is cooler for the horse than sun exposure on a hot day, as it shades the skin whilst allowing ventilation.

Fly rugs are distinct from sweet itch rugs, which require a much finer weave and full-body coverage to address the hypersensitive insect bite response of the IBH-affected horse. A standard fly rug will not provide adequate protection for a horse with sweet itch.

Sweet Itch Rugs

Sweet itch (equine insect bite hypersensitivity) is an allergic skin condition caused by hypersensitivity to proteins in the saliva of biting midges (Culicoides spp.). Affected horses develop intense pruritus — itching — particularly along the mane, crest, withers, and the base and underside of the tail. They will rub these areas relentlessly, causing hair loss, thickened skin, skin wounds, and considerable distress.

Sweet itch rugs are engineered with an extremely fine mesh that Culicoides midges cannot pass through. They cover the entire body including the neck, belly, and tail, and are designed to be worn throughout the midge season — from late spring to early autumn, and particularly at dawn and dusk when Culicoides activity peaks. The rug does not treat the underlying allergy; it simply prevents exposure to the trigger. In combination with stabling during high-risk periods and application of appropriate repellents, a well-fitted sweet itch rug can dramatically reduce a severely affected horse's suffering.

Correct fit is critical: any gap around the neck, belly, or tail provides a route for midges to access the horse's skin. Our comprehensive horse guides include further information on managing common equine skin conditions.

Exercise Sheets

Exercise sheets are partial rugs worn during ridden work, covering the horse's back and hindquarters from behind the saddle. They are used in cold weather to keep the large muscle groups of the back and quarters warm during exercise, particularly during warm-up before a horse has begun generating significant body heat through work, or for horses that are clipped and working in cold, wet, or windy conditions.

Exercise sheets are a practical consideration for competition or training in cold conditions: cold muscles are more prone to injury, and a back and hindquarter that are kept warm will be more supple and responsive. They attach under the saddle girth and behind the cantle, allowing the rider's leg position to be unaffected. Quarter sheets (shorter versions covering only the hindquarters) are available for horses that tend to run warmer or where full coverage is not needed.

How to Measure for a Rug

Stand your horse squarely on flat ground. Using a soft tape measure, place the zero end at the centre of the chest — the midpoint of the breast, where the rug's front closures will fasten. Run the tape along the horse's side horizontally, following the contour of the body, to the furthest point of the hindquarters. The measurement in feet and inches gives your rug size. UK and European rug sizes typically run in 3-inch increments: 5'6", 5'9", 6'0", 6'3", 6'6", 6'9". If your horse falls between sizes, always size up.

Neck covers are sized to match the body rug and attach at the withers and along the spine. A well-fitting neck cover should lie flat without pulling the rug back toward the tail or creating pressure ridges. Measure the neck length from poll to withers along the crest if ordering a separate neck cover from the body rug.

Rug Fit and Common Problems

A correctly fitting rug should lie flat over the entire body without pressure points on the spine — there should be clearance at the withers and along the entire vertebral column. The rug should not pull forward onto the neck when the horse moves or grazes, nor should it slide backward onto the hindquarters.

Leg straps (used on turnout rugs to prevent the rug blowing back) should be threaded through each other in a figure-eight pattern before fastening — this links the back legs loosely together and prevents the rug from twisting. They should be adjusted so that approximately a hand's width fits between the strap and the inside of the thigh. Too tight and they cause rubbing; too loose and they catch on objects or allow the rug to shift. Cross surcingles (belly straps) should allow about two hand-widths of clearance.

Rubs are the most common rug problem. Shoulder rubs — where hair is lost along the front of the shoulder — indicate that the rug is too small, is pulling backward from the neck, or lacks a shoulder gusset. A rug with a built-in shoulder gusset allows the shoulder blade to rotate freely without dragging the front of the rug with it. Wither rubs indicate pressure on the spine and mean the rug is either too wide across the back or is pulling too tightly at the front. See our horse guides for more on managing common tack and equipment challenges.

Caring for Rugs

Turnout rugs should be washed at the end of each season with a specialist rug wash that does not damage the waterproofing membrane. Standard household detergents strip the durable water-repellent (DWR) treatment from the outer shell, causing the rug to wet through even though the underlying waterproof laminate may be intact. After washing, apply a spray-on reproofing product — or tumble dry on low heat if safe for the product — to restore DWR performance. Check all straps, buckles, and stitching for wear and repair before storage.

Store cleaned, dry rugs folded neatly or in breathable rug storage bags in a dry location. Never store rugs whilst damp — this promotes mould growth in the filling that causes smell, deterioration, and potential skin irritation when the rug is used the following season.

The To-Rug-or-Not-to-Rug Debate

Perhaps no management question divides horse owners more consistently than rugging decisions. The scientific position is relatively clear: horses are homeotherms with effective thermoregulatory mechanisms, and the native and cob types that make up a significant proportion of domesticated horses in temperate climates are well-adapted to cold, wet conditions without rugs — provided they have access to adequate shelter, sufficient forage (which generates digestive heat), and are in good body condition. Over-rugging prevents horses from using their natural thermoregulation, encourages coat shedding at inappropriate times, and can cause overheating and sweating — all of which are welfare concerns.

The situation is entirely different for clipped horses, for Thoroughbred and warmblood types with less coat, for older horses or horses in poor condition, and for horses in hard work who have been clipped to manage their workload. These horses genuinely need rugs to compensate for what they lack in natural insulation. The decision to rug should always be based on the individual horse's needs — not on habit, yard convention, or the desire to demonstrate ownership.

Frequently Asked Questions

How do I measure my horse for a rug?

Measure from the centre of the chest horizontally along the side of the body to the furthest point of the hindquarters. This measurement in feet and inches gives your rug size. If between sizes, always choose the larger size.

What fill weight should a horse rug be?

Fill choice depends on clip level, breed type, weather, and individual temperature regulation. Use 0g for mild wet weather, 100g for cool conditions, 200g for cold conditions on clipped horses, and 300g+ only for very cold weather or fully clipped horses. Never rug an unclipped native breed heavily in a typical UK winter.

Should I rug my horse in winter?

Unclipped native breeds with full winter coats and access to shelter and sufficient forage generally do not require rugging. Clipped horses, Thoroughbred types, elderly horses, and horses in poor condition benefit from rugs to compensate for reduced natural insulation. Base the decision on individual need, not habit.

How do I stop a rug rubbing my horse?

Most rubs result from poor rug fit or a rug lacking a shoulder gusset. Ensure the rug is the correct size, has a built-in shoulder gusset, and that no straps are twisted. A silky lining panel at the shoulder reduces friction. Replace rugs that press on the spine rather than attempting to pad around the problem.

What is a sweet itch rug?

A sweet itch rug is a full-body fine-mesh rug designed to prevent Culicoides midges from reaching the skin of horses with equine insect bite hypersensitivity. Unlike a standard fly rug, it has extremely fine mesh, a full neck cover, belly flap, and tail cover to prevent midge access to all susceptible areas.

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Disclaimer: This article is for educational purposes only and does not constitute veterinary advice. Always consult a licensed equine veterinarian for diagnosis and treatment.