When it gets down to around 24 or 25 that's when my fingers and toes go numb. That's only happened twice this winter. If I lived someplace where this happened regularly I would use chemical handwarmers. I scoffed at them before but one evening a co-worker gave me some half dead ones that she had used on her commute in. She was driving but she is very cold blooded and a relative had gotten her the handwarmers for Christmas. It was around ~30 which is a temp that my regular gloves can handle but the warmers definitely made a difference. Neoprene is neoprene. Whether it goes on over your shoes like the Adidas booties that I have or whether it goes inside your shoe like the socks you bought or Seal-skinz or something else, if it is going to work, it is going to work. Hands and feet are difficult to heat. There has to be heat there from your circulation. Some people have naturally good circulation to their extremities, some don't. It doesn't appear that you do. I have gone out on identical 28* mornings and on one my fingers froze and another they didn't. If I had to mess with a tire or brake with my gloves off and then put the gloves on over nearly numb fingers then they could be ski gloves, it is going to be a miserable ride. Try not to let your hands get too cold before your ride starts. Feet are not that different. Heat must be input from somewhere (batteries or chemically) if there isn't enough natural warmth from excellent circulation. FWIW.

H