A turnout rug is a waterproof outer blanket designed to be worn by horses and ponies while living outside in a field or paddock. It is the most important item of weatherproofing in a horse owner’s kit — a correctly chosen turnout rug keeps a horse dry, comfortable, and able to regulate its body temperature even through extended periods of rain, wind, and cold. The term “turnout” refers to the practice of turning a horse out to pasture, as opposed to stabling it overnight.
Construction and Materials
Modern turnout rugs are engineered for outdoor durability in a way that older canvas New Zealand rugs simply were not. The outer shell is typically a rip-stop synthetic fabric — most commonly 600D, 900D, or 1200D polyester or nylon (the ‘D’ standing for denier, a measure of thread weight and therefore durability). Higher denier means more resistance to tearing when a horse rolls, gets caught on a fence, or is kicked by a field companion.
The outer shell is bonded to a waterproof breathable membrane — similar in concept to a human hiking jacket — which prevents rain from penetrating while allowing water vapour (sweat) to escape outward. Without this breathability, the horse would overheat and sweat under the rug even on a cool day, creating the very dampness the rug is meant to prevent. Reputable brands treat the outer fabric with DWR (Durable Water Repellent) coating, which causes water to bead and run off rather than saturate the surface.
The inner layer depends on rug weight:
- Lightweight (0g fill): A waterproof shell with no insulation, used in spring and autumn to keep rain off without adding warmth.
- Mediumweight (100–200g fill): A layer of hollow-fibre or down-alternative filling for cool but not cold conditions.
- Heavyweight (300–400g fill): Maximum insulation for winter use, equivalent to wrapping the horse in a duvet under a raincoat.
Fit and Fastening Systems
A well-fitting turnout rug is one of the more nuanced purchasing decisions in horse ownership. Rugs are measured by the length of the horse’s back in feet and inches — typically from the centre of the chest, along the side, to the point of buttock. A rug that is too short will pull back from the shoulders, restricting movement and rubbing the withers. One that is too long will shift and rotate, eventually hanging underneath the belly.
Fastening systems on quality rugs include cross-surcingles (straps that pass under the belly in an X), hind leg straps (passing through each other in a loop behind the hindquarters), and a front chest closure — usually a combination of clip buckles and velcro or D-ring straps. Neck rug attachments are also common, extending coverage over the horse’s neck and reducing the risk of rain finding its way in at the wither. Horses with a history of escaping their rugs or casting them may need additional security features.
Choosing the Right Rug Weight
A common mistake is over-rugging — putting a heavy rug on a horse that is better off with a lighter option. Horses generate substantial body heat through movement and digestion. A Thoroughbred clipped out in January needs significant warmth support; an unclipped native breed living out in the same conditions may need no more than a lightweight waterproof. The BHS emphasises that over-rugging suppresses the horse’s natural thermoregulation and can contribute to heat stress and excessive sweating — the opposite of the intended outcome.
The horse’s coat status (fully coated, partially clipped, or full clip), access to shelter, individual cold tolerance, and the severity of the local climate all factor into rug selection. A yard in the Scottish Highlands and a field in Surrey are very different environments, even in the same month.
Frequently Asked Questions
Do horses always need a turnout rug when outside?
No. Horses with a full, unclipped winter coat and access to a field shelter are generally capable of managing cold and light rain without a rug. Turnout rugs are most important for horses that are clipped (their natural insulation is removed), those that are elderly or underweight (reduced thermoregulation), and those in very exposed paddocks without shelter. Rugging a horse that does not need it is counterproductive.
How often should a turnout rug be washed and re-proofed?
Most manufacturers recommend washing at the end of each season using a specialist equestrian rug wash — standard detergents can strip the DWR coating from the outer fabric. After washing, re-proofing with a spray-on or wash-in DWR treatment restores water repellency. Rugs used heavily through a wet winter may benefit from a mid-season re-proof as well. Inspect seams and stitching regularly for wear; a rug that leaks at the seams offers false reassurance.
Can a horse wear a turnout rug in the stable?
Turnout rugs can be worn stabled in a pinch, but stable rugs are a better choice for overnight indoor use. Stable rugs are typically warmer without the heavy weatherproofing outer, which reduces breathability indoors where the horse is not exposed to rain. Using a very heavy turnout rug in a warm, enclosed stable can cause a horse to overheat, particularly if it has been worked that day.