Mammut Men's All-Year Longsleeve Zip Polyester 75%/Wool 25% Imported Uncompromising combination of top high-end functionality and youthful design Uncompromising combination of top high-end functionality and youthful design|The extended back protects sensitive areas from chills|Lightweight quality: merino wool and polyester mix for optimal temperature balance|Midweight quality: merino wool and polyester mix with waffle backing structure for optimal insulation on rapidly cooling parts of the body|