's lightest weight insulating layer, the Patagonia
Ultralight Down Shirt is made with a slim fit - for thermal efficiency - and coated with a Deluge® DWR finish. This is a perfect layer for all day wear on a cool day or to add a bit of extra warmth under another puffy.
100% Nylon .8 oz 10D ripstop
Deluge® DWR (Durable Water Resistant) - Patagonia's proprietary Deluge DWR fabric finish lasts substantially longer than a standard DWR.
Slim fit - Perfect for use under a shell or as a secondary insulating layer