- Men's concrete gray sweater - Truckneck, long sleeves - 1x1 ribbing on sleeves and bust - Zip closure at collar, drawstrings to tie - IKKS #actforbetter: material contains 42% recycled polyester Impossible to miss. On a T-shirt with a contrasting round collar, or on a shirt with a check pattern, the trucker collar makes an impact. Drawstrings add a sporty touch.