When thinking about the polycryo vs tyvek argument most people reference these facts:polycryo is the lightestpolycryo is the least expensivepolycryo is available everywhereMy favorite is polycryo rips/punctures easy and develops tear linesTyvek is heavierTyvek makes crinkly noisesTyvek is not waterproofTyvek is available everywhereWhile these checklists are mostly they miss the point:polycryo is a vapor barrier and that’s itTyvek offers some insulation even if it’s just a littleTyvek while not waterproof does have some limitsTyvek comes in different weights for construction and kite makingTyvek can be machine washed to soften the fabricTyvek is more robust and can be used to carry a load and maybe a person (survival mode who cares)But for me the best reason for Tyvek is that living in Florida when it is humid most of the time I won’t stick to it. And while it’s mentioned here as a groundsheet it could also be used as a blanket or insulation in a hammock.remnants - out of stockWhat I like about the 2GoSystems remnants is that it makes a perfect groundsheet. It has all the insulation of the tyvek and adds a reflective coating. In a sudden rain shower it’s a shelter, it’s a groundsheet, or it’s a blanket.BivyI like my Borah Bivy and my Snugpak Jungle Bag but there are hot and steamy Florida days when a net tent, tarp, and simple insulation is needed. You could even make a case for the 2Go bivy and an umbrella.