I find the trousers are great for stuff that's mainly walking with minimal water or flat out crawling, in a mine I'll often wear them with thermal leggings underneath and an old tshirt on top as I tend to run extremely hot, the extra ventilation is so nice in that scenario - not sure id fancy the jacket/trousers combo in somewhere really grotty though. If you, like me, run hot and sometimes do more open mines with walking passages, I would 100% recommend the trousers, although i can't speak for the jacket, as although I've toyed with the idea, I'm yet to buy it. I've worn the trousers with a cheap old waterproof jacket a few times and had no issues with it getting in the way of srt kit, so I can't imagine the actual AV one would either, and I regularly wear the trousers with a fleece jacket, again with no issues at all. The waistband of the trousers is sufficiently high that with the included belt done up, there's no chance whatsoever of the trousers pulling down past your hips.