Staying comfortable in inclement weather is all about layering. Anytime you wear two or more layers it is imperative that your base layer is good at wicking moisture away from your body. The Terramar Tech Skins Thermal Base Layer is lightweight (only 140 grams), extremely breathable and does an amazing job of keep your skin dry during strenuous outdoor exercise (like cycling).
The Terramar Tech Skins Thermal Base Layer is made of 100% polypropylene—this fabric is stain-resistant and provides a decent amount of odor control. Terramar makes three different thicknesses of crew neck base layers and this one is the thinnest. I’ve found that this base layer adds about 6 or 7 degrees of effectiveness, i.e., if you have a cycling jersey that will keep you warm down to 50 degrees, when you add this base layer you should be able to stay warm down to about 43 degrees (your experience might vary). One of the nicest things about this product is that if you get too warm you can take it off and stuff it in a jersey pocket.
There are many clothing companies that sell base layers, so what makes Terramar different? That’s a great question and one that is easy to answer: most companies sell base layers as a sideline, but at Terramar it is their only business! For over forty years these folks have specialized in manufacturing high performance base layers for climbers, cyclists, skiers, hikers, campers and other outdoor enthusiasts. I own a lot of their products and they all show evidence of being well thought out.
The Terramar Tech Skins Thermal Base Layer retails for $20 and is available from many different kinds of stores—from bike shops and ski shops to places like Gander Mountain (that’s where I bought mine). This product is available in five sizes for men (S, M, L, XL, and 2XL). Terramar also has a version of this product available for women, the Women’s Polypropylene Baselayer (S, M, L, XL, and XS). This product is manufactured in China.