I’ve recently had the chance to use a leather guitar strap from Italia Leather Straps, and I can say that these are very well made guitar straps. The one I have is their black on black model, as shown in the picture. In addition to being very well made, the straps carry a lifetime guarantee, so if anything does go wrong with the strap, they’ll replace it for free. As they say on their website: “An Italia Strap is the last guitar strap or bass guitar strap you will ever need to buy.”
I’m used to using nylon straps that came with my guitars. Immediately upon feeling the leather strap by Italia, you realize that it’s a completely different feel than the nylon straps I’m used to. The strap feels like a much higher quality strap and feels like it’ll last for a long time. The leather is also more comfortable than the nylon straps I’ve been using.
If you’re in the market for a new guitar strap, I’d recommend checking out Italia Leather Straps.