Cascade Eco Highland Duo Yarn - 2204 Ecru Cascade Eco Highland Duo Yarn - 2204 Ecru. An all natural, warm yarn. Eco Highland Duo is a loosely spun single ply. 70% Baby Alpaca / 30%Merino Wool 100 grams 197 yds. 4.5 sts per in on a US#8 Worsted Weight [4] Hand Wash Cold. Lay Flat to Dry.