Sierra says: Keeps you warm and dry under the toughest conditions.

Sierra Says: This thermal bottom is ideal for the days when you need a warm, waterproof layer to keep you jonesin' in the gnarliest of conditions. Burton Says: Our Warmest First Layer.

Sierra Says: The perfect remedy for Armageddon-like temperatures, this top is not only uber warm but also very breathable. Burton Says: Our Warmest First Layer.

Sierra says: This fleece is quick-drying and highly breathable. Stretch 360 for unlimited mobility and stink-proof antimicrobial finish. 1/4 Zip venting with super soft zipper guard at chin. Burton says: For the double-digit sub-zero 20 minute life ride.

Sierra says: The ultimate winter warrior.

Sierra says: The very classic 1/4 zip comes with a longer body than normal so that when you're strapping in you don't have to worry about coming untucked. Great for breathing and staying dry. Comes in tropical green. Burton says: Dry heat for the deepest freeze.

Sierra says: Quick-drying and highly breathable with DRYRIDE ultrawick stretch microfleece. Softlock seams for comfort and softwaist logo elastic waistband. Burton says: Packs more heat than Chuck Norris with a sunburn.

Sierra Says: Micro fleece do way more then keep you warm. They are made to take the moisture that your body creates and wicks it away from your body and it dries before it can cool you off. So i guess they do keep you warm, but dry too!

Sierra says: These first layer pants keep you all nice and toasty without the unnecessary sweat that goes along with it. Comes with a shorter inseam that won't bunch in your boots and it comes in tropical green to match the expedition zip. Burton says: Protect your buns from freezer burn.

Olympic retro meets new-school high performance

Sierra says: The Burton Girls Explorer Youth Crew Thermal keeps your girls from being soaked with sweat or uncomfortable in any way. The soft, thin fabric still keeps them warm like you'd never imagine.

Sierra says: Just like the crew, the Burton Girls Explorer Youth Thermal Bottom keeps the little ones dry and warm all day on the mountain.

Sierra says: Who doesn't love polka dots?? The Burton Lightweight Henley Thermal comes with the cute and accessible button down design.

Sierra says: Double-knit closed cell mesh fabric with quick-drying and highly breathability. Stink proof antimicrobial finish and chafe-free softlock seams for comfort. Softwaist logo elastic waistband is ideal for year-round outdoor activity. Burton says: Roast beef, not nuts.

Sierra says: Double-knit closed cell mesh fabric with quick-drying and highly breathable fabric. Strap in without your shirt un-tucking. Ribbed cuffs and collar, ideal for year-round outdoor activity. Burton says: Dry is fly.

Sierra says: Double-knit closed cell mesh fabric with quick-drying and highly breathability. Stink proof antimicrobial finish and chafe-free softlock seams for comfort. Softwaist logo elastic waistband is ideal for year-round outdoor activity. Burton says: The ankle itch eliminator.

Sierra says: Core comfort with a little bit of glam and style. The Burton Lightweight women's thermal crew comes in a fun and intricate design that will provide you with dryness and comfort all day long.

Sierra says: Breathe easy with the Burton Lightweight women's thermal crew. Comes in fun and colorful designs that allow you to stay warm and dry no matter what the conditions.

Sierra says: Comes in a very fun and cute tropical brass cupcakes print and true black tidal wave print. Either way you can have a lot of fun in these layers. These truly are the frosting on top of the cupcake. Burton says: Kiss pit puddles goodbye.

Sierra says: 180 degrees of unlimited mobility and a shorter inseam so that there's no worries of being the slightest uncomfortable all day long while you're tearing up the mountain. Comes in tropical brass cupcakes and true black tidal wave print. Burton says: Ready to rock, from the park to the dance floor.

Sierra says: We'll spare you the wet and give you more of the wild.

Sierra says: Get wild under those pants.

Sierra says: This one piece is the ultimate suit to rock and cozy up to on those chilly winter nights. It features cute and classy gathered details on the chest with buttons, and comes in azul blue. Burton says: Uniform warmth with button-flap bathroom convenience.

Sierra says: Quick-drying and highly breathable are only two of the features that make this shirt comfortable. 360 Of stretch for unlimited mobility. Chafe-free softlock seams for comfort. Burton says: Not too hot, not too cold... it's just right.