Design Philosophy The new MT500 Burner Lite Pullover Jacket blends category leading waterproof and breathability ratings with a clever balance of fabrics and carefully selected features to perfectly bridge the gap between rugged durability and lightweight packability. Exoshell 40 Using an innovative 3-layer construction and weighing in at only 70gsm ExoShell40â"¢ delivers a formidable combination of minimal pack size, immense breathability and high durability. The key to the ExoShell40's impressive breathability rating of 40,000g/m²/24hr and high waterproof rating of 20,000mm, lies in the ultrafine, fluorine free membrane, protected by a superfine denier tricot laminate and impregnated with a proprietary compound that enhances moisture transfer. No Compromise MTB Function This jacket has been designed with riders in mind. To provide an extra layer of breathability, there are two large zipped side vents running up either side of the jacket. These vents have a mesh gusset which stops the jacket flapping behind you while descending. The jacket also packs up into one of it's pockets, allowing the jacket to easily be stashed in a bum bag or frame storage. Functional Storage One of the key features of the Burner Lite Pullover is the large kangaroo style front pocket, giving you easy access to trail essentials. 90 Day Satisfaction Guarantee So confident are we in this product that, if you are not entirely satisfied with it then we offer a no-quibble refund or replacement policy within 90 days of purchase.