We like to step up our fleece game with the Sierra Designs Cold Canyon Hoodie. The grid fleece pattern collects pockets of warm air to keep us insulated in the cold while also releasing excess heat and moisture when our body temperatures spike during high-exertion activities. The nylon panels in front address fleece's Achilles heel—wind—with an internal windbreaking layer while the integrated thumbholes make it easier to layer under a shell in our cold-weather laying system.