Thicker material is naturally insulating Bamboo itself is moisture wicking Offset shoulder seams reduces chafing Long sleeve construction with a straight hemline 4-way stretch offers unrestricted range of motion Best Use:   Casual, Multisport Fabric:   68% Viscose from Bamboo / 29% Polyester / 3% Spandex Fit:   Regular UPF Rating:   50+ Weight:   180 GSM Care: Turn inside out and wash on cold, delicate cycle. We recommend hang drying. Following these simple steps will extend the life of your garment.