TIP. Use natural felt insoles for different type of footwear, f.e. shoes, boots, sneakers, slippers, balerinas etc.
It's very healthy and breathable yet causes excellent amortization absorption when walking.
Wool Felt Insoles are great:
-- to reduce shoes / boots / sneakers / any footwear size
-- to keep extra warmth inside the shoes
-- for very comfortable walk
-- for better shoe amortization
Prevents heat loss. Fit most shoes.