Finished measurements:
About 7½ (8½, 9¾)“ 19 (21.5, 25) cm foot circumference (with cross-rib patt on instep slightly stretched), 8¼ (9¼, 10¼)” 21 (23.5, 26) cm foot length from back of heel to tip of toe, and 7½ (9½, 9¾)“ 19 (24, 26) cm leg length from top of leg to base of heel
Socks shown measure 8½” 21.5 cm in foot circumference

Yarn:
Shown in chickadee / chanterelle 118
2 (3, 4) skeins

Gauge and yarn requirements also given for Finch, Lark, Osprey, and Puffin.