This Giordana Sleeveless Base Layer is ideal underneath your jersey for a variety of situations. Summer riding in the mountains Brisk mornings Trans-seasonal days with changing weather conditions Check all the above. The sleeveless base layer is the perfect foundation to build your modular clothing system for the day. Its Dri-Release fabric wicks moisture like crazy to keep you from being sweaty and potentially chilled on the descents or in the cool air of the morning. It drys out four times faster than cotton, yet it has a cotton-like softness -- something we appreciate against the skin. Giordana treats their base layers with Freshguard to keep them from getting too stinky. Another plus of the Giordana Sleeveless Base Layer is that they are quite forgiving in the wash and won't pill or shrink unless you do something terribly wrong. It's available in four sizes from Small to X-Large.