Used these for the first time riding by bicycle in 18 degree weather. At first I used the trigger finger, but it was too cold, so I put all my fingers in the main part. Thumb was a little chilly, but not too bad. Both the mitten and the liner were marked medium, but the mitten is huge. Overall this seems to be the best bang for the buck when it comes to warm hands. The trigger finger does give you some extra dexterity when needed.