That is something that I had to learn the hard way after I damaged several of my Sig Sauer pistols with using leather holsters in the summer that caused the inner side of the gun to rust.   I don’t know why Sigs aren’t made with a better finish, but I have learned to switch to Glocks in hot weather just because I know the guns won’t rust.   It’s taken me awhile to get use to them, but the higher capacity and a couple ounces lighter of a gun actually makes life easier in the Summer heat.  Kydex holsters are pretty much the standard now because re holstering is also easy  under stress.

I really do like the Don Hume holsters, Galco and especially the Desantis holster line.   There are big differences in the cost of these leather holsters and the Desantis holsters are somewhat pricey but they really do look good and have a very nice finish.   One thing that I did not like about some of the IWB holsters that are leather is they do start to flop with age and re-holstering under stress is something that can be a problem.  The IWB tuck-n-go holsters are difficult to re-holster. I actually suggest taking the holsters off for safety sake.