KETL Mtn Shoulder Season Base Layer Bottoms Black Men'sBuilt for the in between. When it is too cold for shorts but too warm for heavy layers, the Shoulder Season Base Layer Bottoms are the perfect middle ground. Made from the same ultra breathable mesh fabric as our Egg Cradle Boxer Briefs, they strike the ideal balance between warmth, airflow, and comfort. The lightweight mesh construction keeps air moving to prevent overheating on cold morning runs or high exertion winter activities while the soft