Would hardly call these thermal gloves.  Couldn't imagine using them any lower than the high 40s or low 50s.  purchased the "pro" version of the PI gloves as well to compare and indeed they are a bit thicker/warmer.  That said, on a day of 35 degree weather, they didn't stand a chance either and were made usable with a under layer below it.  If you were to purchase these, I would suggest a second, thicker, wind-proof layer above it for anything below the mid-40s