Push through to the top of your climb despite the cold front that is starting to blow in by slipping on the Arc'teryx Sigma SL Anorak. This super light pullover windbreaker is built specifically to block wind while you climb and scramble to the summit. The Aequora Airperm softshell outer boasts impressive breathability and durability to ensure you can stay focused while you look for the next hold. Meanwhile the adjustable hood is completely helmet compatible so that you can stay prepared while you block out the storm.