When the weather is just a bit below prime you'll need to layer up right, a great way to get your core sorted is with Caselli's Prosecco R Short-Sleeve Base Layer Top. This light base layer sits close to the skin, and traps heat on the inside, while actively moving perspiration away from you. The slim fit is ideal for eliminating bulk, and sliding nicely underneath your favorite jersey. And because the layer has a fun bright pattern, you don't have to feel self conscious when the temps warm up and you ditch your toasty outer layer to get some sun on your arms.