Hold on tight because Muk Luks Heritage Sleigh Ride Collection will take you for a ride on the fabulous side. This collection is made up of holiday inspired knits and patterns. The Snowflake Zig Zag Arm warmers are made of 100% acrylic and make it possible to still wear your favorite short sleeved shirts during winter. This style should be machine washed on gentle cycle, no bleach, and laid flat to dry. Material: Acrylic.