Just tried on my new 6.1's for the first time. Haven't tried sticking them in a boot yet, but they are definitely the thickest sock I've used in the past 20 years. Should be interesting, especially since I added Carv Sensors too. First day out this season might be more than a bit uncomfortable.
How quick do these typically take to warm up? It seems like it took about 5 minutes before I felt any heat at all while set at the highest setting. My previous Hotronic insoles, got super toasty really quick.