Timp 6 GTX

I think you'll have better luck asking in r/AltraRunning There will be more people who actually know about these two models there, but also they don't mind answering q's about similar shoes in my experience. But to answer your original question, I've been trying on the GTX shoes from Altra trying to find a pair for winter. They used to waterproof their non gore tex models but they don't seem to anymore. I have really wet slushy conditions where I live. The snow clung to my LP7 and made my feet too cold. The GTX LPs are made on the same base/outsole, but the upper material itself isn't as flexible. Like someone else said, it's more snug. But also the upper seems to be slightly different. I tried on the Timp 6 GTX versus the Timp 6 and I was so disappointed that they moved the heel collar just enough so that it rubbed my ankle knots, whereas the non GTX version did not. I don't know if that's the case with LP, it's just a heads up. Also my experience with gore tex is that it's a more fragile fabric, so it's more prone to failure. It's not breathable, either, so if you get sweaty, you stay sweaty.

I think you'll have better luck asking in r/AltraRunning There will be more people who actually know about these two models there, but also they don't mind answering q's about similar shoes in my experience. But to answer your original question, I've been trying on the GTX shoes from Altra trying to find a pair for winter. They used to waterproof their non gore tex models but they don't seem to anymore. I have really wet slushy conditions where I live. The snow clung to my LP7 and made my feet too cold. The GTX LPs are made on the same base/outsole, but the upper material itself isn't as flexible. Like someone else said, it's more snug. But also the upper seems to be slightly different. I tried on the Timp 6 GTX versus the Timp 6 and I was so disappointed that they moved the heel collar just enough so that it rubbed my ankle knots, whereas the non GTX version did not. I don't know if that's the case with LP, it's just a heads up. Also my experience with gore tex is that it's a more fragile fabric, so it's more prone to failure. It's not breathable, either, so if you get sweaty, you stay sweaty.

Sadly the Timp is too narrow for me. The Topo Pursuit 2 is on the list and I will try it as soon as I get my hands on a pair. I tried several Altras (Timp 6, Olympus 6, Mont Blanc, Olympus 275), but none was a match.

I have trouble finding the right zero drop/wide toe box shoe. I am happy with my Altras on the road, like Paradigm 6 and Torin 8. I currently run on Lone Peak 9+, which fits perfectly fine, but I just wish it had more cushioning. I tried Timps, Mont Blancs, Olympus 6, Opympus 275…either issues with heels or too narrow.  Then again I wonder if I would be happy with more cushioning at all on technical trails. I just finished my first self sustained marathon (43km/1500m vert) and it didn‘t feel bad, there is just the little voice that tells me that I might be wrecking my joints too much in the long run (pun intended). 

Also check out the Altra Olympus. I prefer them over the Timp for days I want cushion.

Those shoes gave me the worst plantar fascia issues and I hated that I couldn’t heel lock the laces. I switched to the Altra Timp 6 and have had zero issues

I'm running in Altra GTX with gators this winter. No waterproof shoes are not perfect but they are the best I've found for running in the winter slop.

This is why I dont understand a lot of the footwear I see people on trail up here with... toebox and weight. I picked up some goretex altras and have put about 10miles on them so far at bridal veil area. Also have 2 different sets of gaiters to try out on the way, one being the rain gaiters from zpacks. Even in the rocky desert I usually dont wear gaiters but I guess its time to learn to adapt to the muddy days.

I wear Altras GTX are waterproof. (In California.) If its snow I wear my waterproof boots.