Thermatex Cordura covered ones - dry out wet legs and don't get bedding stuck to them. Wash well and last forever (I speak as a grey show cob owner who does a LOT of washing!)
Indefinitely - they are secured by Velcro straps and you can't really put them on too tight! I have a friend who washes off her horse's legs every night and leaves them on all night with no problems.
Wish I never read this .I have now asked for a price on an ebay shop for a bossy bib,sportabac turnout boots and thermatex cordura boots.Hope I get a good price!
I have the thermatex ones too, they are fab. I now leave them on baron every night after washing his legs off. So far this year he has no mud fever, which is a first. And they keep him nice a tosty.
I have the normal thermatex ones and love them, traveled my boy in them the other day to and they stayed on perfectly and he normaly trashes travel boots!