Investing in a base layer might seem like an unnecessary step, especially when you're comfortable in the kit you already have, but layering with the Pearl Izumi men's Transfer Sleeveless Base Layer can actually enhance a jersey's cooling and moisture-wicking capabilities on a hot summer day. The sleeveless design is versatile enough to fit under jerseys from early in the season through fall, with a contoured fit to follow your body movements in the saddle and smooth, chafe-free seaming that you'll hardly notice over your bibs. The Transfer is made from Pearl's ultralight P. R. O. Transfer mesh fabric that speeds up the evaporation process as you sweat. Airy mesh constitutes the base layer's construction to further encourage airflow, and when the weather takes a cooler turn in the fall, the entire base layer will continue to wick moisture away from your skin under thermal layers, warding off a damp chill that can make the final 30 minutes of a base mile ride miserable.