Cold days bring the best climbing conditions and the Arc'teryx Thorium men's down insulated jacket lets you make the most of them. Designed for durability, this belay jacket features bold baffling stuffed with 750 fill down for reliable warmth, while the rugged mini-ripstop shell withstands sharp rock. Climbing-specific details like a two-way front zipper for harness access and oversized internal dump pockets make it an essential layer for the chilliest sessions.