Endura singletrack merino short sleeve jerseymerino wool has excellent natural properties including thermal insulation that keeps you warm when its cool and excellent breathability to keep you cool when its warm the material also has excellent insulation even when wet this relaxed fit jersey will remain comfortable on the trails no matter how long your ride is features material polyester 53 coolmax 37 wool 10 coolmaxmerino blend stretch fabric 34 length front zip discreet rear zippe