It fits like an XL by general sizing standards. The coldest temperatures I have work it in is 40 degrees and it kept me warm. it is baggie enough to fit a base layer underneath and stretches so that you can wear a sweatshirt or hoodie underneath. the sleeves and hem have an elastic band to help keep the warmth in the jacket. the band are not restrictive as I pull them over my g- shock watch and it doesn't feel right or comfy l compressed