A crochet pattern for a polo neck sweater in Patons Symphony. Crochet Hook: 7mm (UK2, US10.5) Number of 100g balls of Symphony: Chest size 30 to 32 inches: 8 Chest size 34 to 36 inches: 9 Chest size 38 to 40 inches: 10 Chest size 42 to 44 inches: 11 Photographed in shade 01.