The Pockets Sleeveless Base Layer was designed by Giro to keep your core cool and dry, in addition to providing you with rear storage options for all of your ride essentials. It's an innovative layering piece that works double duty to keep you comfortable and your valuables secure through its sleek pocketed design. The base layer was constructed using a polyester and elastane blend, which effectively wraps your body for a smooth, torso hugging fit. This material works to pull moisture away from your skin to keep your core dry, cool, and comfortable underneath your additional upper body layers. Knowing that many riders still like to wear base layers underneath casual riding clothes absent of the traditional jersey's rear pockets Giro incorporated three pockets into the base layer itself. This design lets you securely stash your valuables underneath your other layers and out of sight. The Giro Pockets Base Layer Sleeveless Women's is available in sizes X Small to X Large and in the color White.