Holster Heat

So I have a slightly odd question regarding holsters. I've been carrying for a few years now and have tried a few different brands of holsters, I'll admit that for the most part I've only used mixed holsters (crossbreed, alien gear, etc). The biggest problem I keep coming across is my holster gets so hot it's uncomfortable to carry. I wear an undershirt, so it's not even against my body but it holds in heat super bad, especially in the summer.Does anyone have a suggestion that helps prevent the heat build up on the mixed holsters? Aside from the obvious dress for the weatherSecond question, does anyone have a holster they recommend that will stay cooler on its own, without taking extra steps to keep it cool, other than the obvious dress for the weather? via /r/CCW https://ift.tt/2RIS8aw