Katin Boy's (8-16) Duke Hybrid Trunk The Duke Hybrid Trunk is a tri-blend stretch trunk featuring a lace-up waist, 16" outseam, snap fly and interior stash pocket. Our tri-blend stretch is made from 70% REPREVE recycled polyester, 20% cotton and 10% spandex. 70%?˜REPREVE receycled polyester, 20% cotton and 10%?˜Spandex Tri-blend stretch trunk 16" outseam Snap fly and interior stash pocket?˜