I've been thrashing my personal Core Rat Deluxe Jacket for years. Last year I fell to my elbow, grinding the jacket sleeve down frozen, hard as rock dirt. I was sure I destroyed the sleeve. No damage whatsoever! This jacket is built to last and the removeable sleeves make it highly functional for mountain-bikers! This handsome jacket is hand made! Stylish enough to wear out to dinner and heavy duty enough to wear over armor on those cool morning/wet runs. - Abrasion proof 500 denier nylon Cordura shell - Water Resistant and fast drying - Mesh lined for comfortable wear - Removable Velcro-attached sleeves - Hefty, long-lasting metal zipper - Cool racing stripe down front - Large rear pocket with cover flap