what is a 3D thermal collar
What is a 3-D thermal collar?
Grüezi Bag has developed a thermal collar that prevents cold bridges simply by closing the zipper. There's no longer any need to awkwardly close a Velcro fastener.
Grüezi Bag has developed a thermal collar that prevents cold bridges simply by closing the zipper. There's no longer any need to awkwardly close a Velcro fastener.