Size medium (fits Euro sizes 38-40). Light down-padded booties for cold winter nights in the backcountry. Produced without PFAS. Lightweight outer fabric and lining in 100% recycled polyamide. Padded with high-quality ethically produced down. Reinforced along sides with durable Oxford weave in recycled polyester. Insulating foam footbeds and brushed tricot inner soles. Elastic drawcord adjustment at the ankle.