Years ago I got a pair of The North Face down boot slippers like these:
https://di2ponv0v5otw.cloudfront.net/posts/2017/12/29/5a470d97739d48e219142...
They've been well and truly worn out, but TNF seem to have stopped doing them and now only do low cut slippers which aren't going to keep my feet warm! Has anyone seen any down boots around these days? There seem to be a few synthetic ones around but I can't see any down these days...