A super lightweight and packable sock updated with PrimaLoft Silver synthetic insulation and recycled fabrics. Ideal for use on expeditions, hut tours and backpacking to warm up your feet and lock in the heat on chilly evenings. Above-ankle height with stretch cuff Synthetic insulation is warm, packable and easy to maintain Tough 900D nylon sole for abrasion resistance Synthetic insulated sole for warmth Wrap around construction to reduce seams and heat loss Stuff sack included Weight: 109g/3.8oz (Size M) Material: Outer Fabric - Lightweight and packable recycled 20D polyamide (38gsm) PrimaLoft® Silver 100% post-consumer recycled synthetic insulation (133gsm) UK (Shoe size) US (Shoe size) EU (Shoe size) CM XS 3-4 4-5 36-37 21.5-22.5 S 5-6 6-7 38-39 23.5-24.5 M 7-8 8-9 40.5-42 25-26 L 9-10 10-11 43-44.5 26.5-27.5 XL 10+ 11+ 44.5+ 27.5+