Designed to be worn under thicker hiking or ski socks to prevent blisters are these Bridgedale thermal liner socks.What makes Bridgedale have the best socks in the block is their unique blend of well-ventilated yarn and knitting technology known as: Fusion Technology. It is the combination of the highest quality yarns wrapped with high performance microfibres to ensure all day performance whilst targeted cushioning and mesh panels ensure all day comfort ad ventilation. Bridgedale uses Lycra in three targeted zones of the sock to make sure the sock stays fitted for miles on end. These three zones include the under arch of the foot, above the heel and around the cuff of the sock, all which work together to prevent the sock slipping down and support the foot sufficiently.Lycra helps the sock retain its original shape compared with other technical socks that become baggy over time.Fusion TechnologyThermally-efficientBaselayer / LinerExtra warmthMoisture wicking for drynessFabric: 79% EndurofilTM / polypropylene; 17% Nylon / Polyamide; 4% Lycra / elastaneColour: GreyPack: 2 Pack