S3A(R) silver antimicrobial technology For odor prevention Fleece fabric Keeps you warm when the temperature drops Flatlock seams Ensure all-day comfort The Koretec Base Polar Weight Bottom is your go-to, hard-working first layer. From the heart of the rut to those freezing late-season hunts, our exclusive S3A(R) technology helps keep the stink down while you get the job done. What's more, we've delivered quality and performance without breaking the bank