How do I set up the Arctos 20 as a hammock underquilt? Steph March 30, 2021 21:07 Updated Follow Watch this video to view step-by-step instruction about how to set up the Arctos 20 trail quilt in underquilt mode. Related articles How do I use the Arctos 20 as a hammock top quilt? How can I use my trail quilt as an underquilt? What is the difference between the Roo Double and Roo Single? Comments 0 comments Please sign in to leave a comment.