The Women's Power Stretch Pull-On is a light-weight fleece pull-on, in a Polartec® Power Stretch® fabric, designed for use as a year round mid-layer. The Power Stretch® fabric is highly wind and abrasion-resistant, and a 4-way stretch allows for excellent levels of freedom of movement, lending the Women's Power Stretch Pull-On to climbing and active use. Features include a deep venting YKK chest zip, flatlock low-bulk seams and thumb loops. A slim fit helps to ensure comfortable layering use. FIT NOTES (Slim Fit) This piece is designed with a slim fit which can accommodate a light-weight baselayer underneath.