-Surface material uses the leftover cotton pieces that are cut off when making cotton yarn, and the back pile side uses KODENSHI® spun polyester that has the thermal properties of far infrared ray technology -The form of authentic American sweatshirt is maintained while making it yoke sleeves often seen in outdoor wear Pattern design with seamless shoulder and armhole for stress-free fit -Longer back hem length keeps your back covered when seated -Flat seamer stitching -Brand label also uses a soft ribbon type for less stress -KODENSHI® Classic Fleece(74% Cotton, 26% Polyester)