Definitely sewn. In warm weather, you can always kick your feet out of the box and just have the TQ laying over them. But when you need the warmth, you need the warmth...of sewn! The only exception I'd consider to this is a light summerweight TQ intended only for 50's to 70's temps when you would even be apt to kick your feet out. But even then, the fiddle factor of a drawstring or snaps at the foot end just doesn't seem worth it to me, when it's just as easy to kick it off.
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