Love this jacket and purchased the Depths. I went by the size chart and figured I usually feel comfortable in a 48 chest XL. A large saud a 51 chest and I debated and went with what the chart sizes should be close to. But way to snug for my fit for something in a 51 chest felt more like a 46. I am exchanging for a XL. Item return was a breeze and Customer service top notch.