Giordana Size Chart This base layer begins with Mimosa fabric, a blend of Merino wool, nylon and spandex. Merino wool delivers unique qualities that no other material can duplicate; highly breathable and moisture moving with superior insulation properties, even when wet. Wool's ability to trap countless tiny pockets of air in order to create a microclimate of warmth is unique and the synthetic fibers help to keep the fabric soft and to maintain a contemporary fit. Features: - A cool/cold-weather cycling base layer - Merino wool with synthetics for stretch and durability - Manages moisture and resists odor while insulating - Stays warm even in the presence of moisture - Made in Italy