DEREK LAM 10 CROSBY Twist Back Sweater in Gray. - size L (also in ) DEREK LAM 10 CROSBY Twist Back Sweater in Gray. - size L (also in ) 70% wool 30% cashmere. Dry clean only. Knit fabric. Criss-cross back detail. 10CR-WK41. TP72914WC. Named after the address of the Derek Lam International, LLC headquarters in downtown Manhattan, 10 Crosby Derek Lam is the first ever diffusion line from Derek Lam. 10 Crosby offers accessible styles that are always intelligent and always feature a surprising twist. And true to Derek Lam core principles, each piece upholds value and integrity of design, making every collection look and feel special.