Aspen Crochet Hat & Cowl S108 Crochet Hat & Cowl for chunky Aspen yarn. Aspen is worked on large needles, for quick and easy results. You will need (to make both projects: 7 balls Aspen 10mm crochet hook Cowl measures approx 84cm long x 24cm wide. Hat fits average lady. S108 Aspen Pattern Leaflet $4.95 This pattern leaflet was added to our range on 23rd June, 2016.