I'm 6'3" and 350lbs and the 4xt fits perfectly. The only downsides are what others have commented, in that the sleeves are slightly long, which in my opinion isn't a bad thing since the sleeves have elastic to keep them tight to your wrists. The colors are slightly off from the interior of the hoodie compared to the exterior so you'll get a two-toned look if you have the hoodie opened. Also as others have stated the hood does seem large, but i wear a baseball hat most of the time, so this doesn't bother me so much. It is warm, without being suffocating. I've been using it for two weeks so far, and seems great.