Designed for those who don\\\'t stop for anything, the Hyperchill jacket by Ronhill will become your favourite cool weather running partner. An ideal piece for cool or cold days. Arms, side panels and centre back: 100% recycled Prism fabric has one way moisture transfer with superb thermal properties. Designed with a jaquard honey comb pattern to trap air and insulate the body. Front, upper and lower back (inner): Octa fabric is made from a hollow fibre with 8 protrusions. It is super light, excellent and allowing moisture to transfer away from the body to keep you and the jacket dry. The gaps between the protrusions also trap air for maximum thermal enhancement and minimum weight. Front, upper and lower back (outer): Tornado fabric is super light and keeps the wind chill off. Main Body: 100% Polyamide; Contrast Panels: 92% Recycled Polyester, 8% Elastane; Lining: 100% Polyester