THERMATEX ALL WEATHER NORDIC EXERCISE RUG with roll back outer layer.
Quarter section can be rolled back and secured during fast work to allow moisture to 'wick' through .
This is a 2 in 1 rug, the waterproof outer for rainy days and you can roll the quarter section back on non-rainy days to keep your horse warm on cold days.

4'3 to fit a horse that takes a size 5'9 in a regular rug.
No damage, but has some white hairs on it.

From their website:
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Advanced high performance quilted ‘wicking’ fabric
Manufactured in a unique wool and acrylic blend
Polypropylene insulating layer
Individually hand cut for a perfect fit
Fillet loops and matching string
Velcro closure over withers
Lightweight
Machine washable
Florescent waterproof outer layer with reflective stripes
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Thermatex sell them for over £200, asking £80.
Can post at cost or collect from Minstead.