My Seal Skins are pretty warm, have worn them at 0 degrees C (and that's the coldest temperature I will ride!) and my feet are nice and happy. Wish however there is something that could keep my nose warm that doesn't make you look like a bank robber!
Catrin, I think the lowest temperature I have ridden in with the combo of road shoes, wool socks, booties, and chemical warmers was close to 32 or so. In fact, there was one morning about a month ago that Hirakukibou and i had a planned ride for 6 AM; it was about 33, even though it was still September. We were determined not to bail, and that is the combo I had on my feet. I may have ridden in the 20's, but it would have been nothing more than a 10-15 mile ride on my old hybrid on a sunny day in February.
I also have the Seal Skin socks, which I bought for a tour. They are *extremely* warm, but somewhat a pain to get on/off. I bought them mostly for the waterproof aspect and I have worn them hiking, too.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport
I use the PI Calientoes toe covers on my road shoes (Northwaves) with an SPD-SL cleat...I had to get the XL size (my shoes are a size 42...yes I have clown feet) and they fit the shoes just fine. For rides where the temps start out in the 30's, I switch to PI full shoe covers (the Amfib material ones), also in a size XL which is the biggest size they make. They just fit (like barely) my shoes, but work great. I have to really pull the velcro closure together in the back, in order to get a good seal...but I haven't had any problems with them ripping and I love the rubber-like bottoms that they have. Way more durable and grippy on damp pavement.
I would say for those that are having problems with toe/shoe covers fitting over MTB shoes, perhaps try going up a size or two (if you can) and see if that helps. I find it odd, that although my PI shoe covers *just* fit over my shoes...when my DH has borrowed them on occasion, they actually seem to slide over his shoes much easier...and he wears a size 46 Specialized S-Works shoe with Speedplay cleats. Not sure why that is.
Linda
2012 Seven Axiom SL - Specialized Ruby SL 155