The hot socks are ultra-warm and packable, perfect for basecamp on cold expeditions or as refuge for cold toes on an alpine bivi. Ideal inside a tent or for hut use, the Hot Socks are insulated with PrimaLoft® Silver, a synthetic material made from 100% post-consumer recycled material. With thousands of heat trapping air pockets this synthetic insulation is durable and water resistant.
 
PrimaLoft® Silver Insulation - 100% PCR
Representing a breakthrough in high performance, more sustainable fibre technology.This 100% post-consumer recycled material is comprised of bottle chips that are reprocessed and spun into fibres finer and softer than cashmere, delivering uncompromised loft and warmth. A water-repellent finish gives you freedom regardless of what conditions the weather has in store. Lightweight in nature and designed with packability in mind.