The Columbia Infant Boys' Steens II Mountain Fleece Jacket is simple in design for warmth on walks around the neighborhood or layering for cross-town trips to Grandma's house. Its polyester MTR filament fleece fabric is warmer than average fleeces, and it's more durable for protection during crawling practice sessions. Its modern classic fit means the jacket is semi-fitted so baby doesn't look like a starfish when we add layers to the snow-protection kit.