SanSoleil combines Super Cool Nylon with SanSoleil's mesh inserts and quick cool technology to create the most comfortable fabric for golf, tennis and sport! *Garments with SanSoleil's SolTek ICE fabric run one half to a full size smaller than other SanSoleil garments. SolTek ICE has enhanced stretch for a more athletic fit. Please size up if you question the size you should wear.