I'm always between M and L sizes with gloves (long fingers- 19.5cm from wrist to tip of middle finger, and narrower palms- 23.5cm around). The Medium fits great, long enough fingers (though the pinky seems a bit disproportionately short still) and the palms fit snugly but can still fit a palm protector inside comfortably. These check all the boxes for me- Pinky Bridge, Flex panel on the thumb, hard palm slider, floating knuckle, external finger seems, double gauntlet adjustment. I haven't found all of those features in a single glove at this price point so I'm extremely happy with these. Construction is extremely rugged and they feel like they would survive a serious get off, but they don't feel bulky or restrictive at all. Great buy.