As the design of this jacket is a close fit to the body to maintain maximum warmth, we recommend sizing up for a regular fit. Using hydrophobic down and a patented design construction, the feathers do not clump when wet or create a chamber when compressed. Therefore it maintains maximum warmth and insulation when the environment changes like no other. This jacket is PFAS free.Specially engineered features include; RECCO technology integrated into the jacket, elasticated detailing which is designed to sit closer to the body and keep you warmer, the cuff also has a thumb loop for added warmth and protection on the mountains. Polartec® fleece inside the pockets for extra warmth and micro-fibre fleece round the face to protect from chaffing in extreme conditions, as well as deep mesh inner pockets – perfect for water bottles and gloves. The perfect jacket for Base Camp treks and up to 6,000m peaks, as well as a variety of outdoor pursuits and everyday urban and casual wear. Designed, developed and tested by Nimsdai and his world-record breaking team in the most extreme environments on earth.