This might be the best winter baselayer ever. It relies purely on insulation and not on windblock, but when you combine it with a nice jacket (such as the Craft Storm jacket) it gives you plenty of warmth. The crew neck is just right -- it stops right below the adam's apple. Also, if you're stuck between sizes, choose the smaller size. I can use M or L in base layers, and I'm happy as a clam with M. This sucker is thin, light, and super-warm. You'll love it.