The Hot Chillys La Montana Zip-T shares the same 10 out of 10 warmth rating as the La Montana Bottom, built from the same mountain-weight, micro-denier polyester fleece for a genuine top-to-bottom system. Extended cuffs with thumbholes and a zip-through collar with an interior wind flap seal out cold at the wrists and neck, the two places heat escapes fastest. Micro-Elite Chamois gussets at the underarms and cuffs add stretch for full range of motion, so the heavyweight fleece moves with a stride instead of fighting it. What Our Gearhead(R) Experts Are Saying:"I wore the top and bottom together on a day cold enough that I usually layer up heavier, and for the first time I didn't feel like I needed anything extra underneath my shell. The wind flap at the collar made the biggest difference the second the chairlift picked up speed."