Multipurpose and multi-sport. Critically taped seams. The yellow side is phenomenally reflective for night running (or any activity where safety is an issue at night. Great for layering or alone. Worn twice — I get too hot in temps above 32 to justify keeping this awesome multipurpose jacket. True to size small. Elastic wrist cuff is nice over gloves yet comfortable enough on skin to keep the heat in and elements out. The inner pocket is amazing.