I ordered X-large based on instructions in the size guide. It arrived with a series of 4 size fit holes of appropriate diameters on the cardboard closure. The large hole was a very loose fit. I opened the package anyway. I was interested in a paddle with significantly more resistance than what I have been using. This paddle is great for that but would be too much for a first paddle. I pressed the paddle down with my fingers so it would tighten up the slack. I am posting the cardboard hole diameters (D=) and resulting circumferences (C=) in inches so future buyers have a better chance of ordering the right size. Perhaps Finis will fix their size chart. Small D=0.806;C=2.53 ;;; Medium D=0.908;C=2.85 ;;; Large=1.002;C=3.15 ;;; X-Large D=1.093;C=3.43 For ease of comparison, the Finis size chart in decimal inches at time of posting follows: Small C=2.062; Medium C= 2.437; Large C=2.687; X-Large C=3.062. I deducted stars due to the size chart. The paddle is great.

I love swimming laps with these paddles! At first I thought they were going to be a little too large but they're actually just right. For a larger paddle, it's still easy on the shoulders and not too difficult to push though the water. They feel nice and secured to my hand but easy to slide on and off.

These paddles are awesome and have really helped me with my technique. I can feel myself pulling with a high elbow and really engaging my lats when I am using them. The strapless design makes it easy to get them on and off and also forces me to finish each stroke. I also swim super fast with them, which is really fun. Since I started using them, I feel like my stroke has gotten better and I am getting stronger. As a lifelong swimmer and USMS Head Coach I have tried many different paddle styles. I can honestly say that these ones are a favorite of mine. I would highly recommend giving these a try.

The Manta Paddles are an essential tool for both technical refinement and pace work. Their unique design eliminates lateral movement and minimizes the tendency to coast with the lead arm, promoting continuous propulsion throughout the stroke. The paddles help guide the hand and forearm into an optimal catch position, enhancing stroke efficiency and power generation. Unlike traditional paddles, the Manta Paddles encourage proper stroke mechanics, resulting in improved speed and overall performance in the water.
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