The underquilt is canoe shaped so that it somewhat follows the shape of the hammock. This means if you are taller than 5’6" and like to lay in a diagonal position, your feet may slip out of the quilt area. The taller you are, the more likely this will happen. Also, this is comfortable to about the 40-45 degree range, depending on the wind. Nicely made, but has limitations based on design.