SHEEPSKIN INSOLE Genuine Sheepskin Insole With Memory Foam for Comfort, and Texon Board for Easier Push Inside an Old Pair as Replacement. - Etsy
UGG Australia Replacement Insoles - YouTube
Amazon.com | Wool Felt Replacement Boot Liners: 75% Wool, Navy Blue (826 BB) - Standard Boot (Approx 10” high), Size 8 | Snow Boots
Sorel winter boots bought 31 years ago and they still get regular winter use. I replaced the liners three times over the years and had one rubber fix that I recall. :