The women's Ronhill Core L/S Tee is a great all-year round option. Made with a breathable and sweat wicking fabric, it functions perfectly under a running jacket or by itself on milder days. The Vapourlite fabric draws moisture from your skin and makes it easier for sweat to evaporate through a jacket. On mild weather days, a long sleeve running top offers a bit of extra protection over a short sleeve. The lightweight material lets heat escape easily. It's also to roll up the sleeves, as the material is soft and flexible. This is a great way of making yourself feel cooler if you heat up on a run. Material Benefits The lightweight and breathable material in this long sleeve running top performs in a range of temperatures. Fit Guide Choose your normal clothing size in the women's Ronhill Core L/S Tee. It's made in a relaxed fit and will not fit skin tight like a base layer. Ideal Run Conditions Wear this long sleeve running top when you have doubts about being warm enough in a short sleeve. Also layer it under a running jacket. Technical Features Breathable Wicking Relaxed fit Vapourlite fabric Approximate weight: 114g 100% polyester