Finding a good base layer can be difficult, as it needs to work equally well in the summer heat as it does in cold climates. Pearl Izumi's Transfer Base Layer does just that by making use of Pearl's P. R. O. Transfer fabric with Minerale. The Transfer fabric features a porous yarn structure that gives it eight times the surface area of typical poly weaves, which facilitates the wicking and evaporation of moisture. Also, the Minerale treatment permanently added to the fabric utilizes natural volcanic minerals to boost evaporative cooling, provide anti odor capabilities, and deliver UPF 30 sun protection. Pearl Izumi paid just as much attention to the fit of this base layer, seeing as the last thing anyone wants is a floppy, oversized undergarment. The shirt's close, anatomic fit not only lies nicely under a jersey, but enhances the wicking power through full contact with the skin. The arm and neck openings strike a perfect balance between being too roomy and too snug. The tail drops down a touch to facilitate tucking it into bib less shorts. The Pearl Izumi Transfer Short Sleeve Base Layer is available in sizes Small through XX Large and in the colors Black and White.