You can focus on tongue position

If you measure more than 20cm from temple to temple (see picture below)

The Monofin Protection is reinforced against impact

This improves comfort

C4 Carbon - Knife Naifu White weightstrap You can focus on tongueC4 Carbon Knife Naifu Both C4 Carbon NAIFU and NAIFU S WHITE feature a white teflon coated blade. This particular finish makes the blade more resistant to wear and reduces friction to cutting. The blade is also easier to clean and to sanctification. The handle is made in white thermoplastic and in combination with the white blade make the knife extremely visible in case of loss on the bottom of the sea. Blade protection Two rubber straps with