As an Australian, the only good time you will ever find something deeper than a centimeter (that's like half an inch for you Americans)is off piste. And I'm not talking traverse over there. I'm talking about skinning or hiking for an hour. This can be detrimental to you if it's a hot day. (It most likely will be) So you sweat, like alot. This is where the orage Mic Mac base layer proves itself, again and again. Being a lightweight base layer allows me to not me dragged down by unnecessary weight. Along with the polyester material it wicks away moisture. Keeping me dry and allows my skin to breathe. I've also had this base layer for about four seasons now and have used it every day for around 200 days which include, the ever so hot Australia, Japan, Whistler and now I am currently using it as a base layer for walking around Canada. This piece will fit perfectly under your XXXL cotton hoodie so you don't need to worry about calling it a day early when your cotton freezes. And it will. Overall, I highly recommend to product to anyone and everyone on NS. It's cheap coming in around 50 bucks and you only have to wash it maybe once a month. Wear it everyday and provide you use deodorant, you'll be fine. Unless yo're Andy Parry.