These arrived first, a week before the other brand on Amazon. Turns out they are exactly the same. Likely the same manufacturer, just different brand names, but same product, function, performance to date . I'd recommend both brands-just buy the cheaper one at the time of purchase.
Love them. Been using consistently for 3 months. Have washed them in a zippered bag per instructions. Work great. They warm my toes and midfoot nicely. Not aggressively, but noticeable. The highest setting "red" will auto switch to medium "white" after 5 min. This is for safety and battery life. Many times they feel very toasty and I step down to low "blue" setting.
I hate wearing socks to bed, but my feet have to be warm for me to sleep. If I plan ahead, I'll warm my feet with these up to an hr before bed and then remove to sleep.
Admittedly, I'm not that efficient and often put the socks on as I get into bed. They warm quickly and nicely. The battery packs tuck nicely into the pockets and don't come out overnight. If I sleep quickly, I don't get a chance to put them in the low setting, I will often awaken during the night and remove them or keep the sock on but power down. They are easy on and off and don't require a lot of brain power, which would wake me up.
I use them when cold/chilly in the house too. Especially, lazy weekend days. Walking in slippers or clogs is comfortable. Don't feel the wires with these types of footwear. Haven't used them inside boots or tighter shoes. They do warm the tops and bottoms of my toes and into the midfoot. No direct heating element to the heel, but not needed for me. My heel and lower calf warm easily with the toes and midfoot warm.
I ended up keeping both pairs bc I like the extra battery pack and ability to switch out. Use them almost daily. You CANNOT DRY these in a dryer and they can take a good 1-2 days to airdry. So, I'm glad I have another pair to use almost daily.
Tall socks that go to upper calf, not over the knee, for me. I'm 6'2" and have 16-17inch calves and fit nicely with size Large. Not tight, but snug that they don't shift or fall down easily.