These cut-down fins are intended to improve kick muscles and technique, rather than give any great increase in propulsion - for that fit bigger fins! They are not the same as
Zoomers which are a bit shorter, but have a wider rib on the sides of the feet.
They are cast from just one piece of rubber, with no joins to fall apart. I think this is a great plus point, because all my previous fins have rapidly disintegrated where the different stiffness plastic and rubber meet. These seem to be showing no signs of distress at all.
They are comfortable if you manage to find the right size for your feet. The heel is a perfect fit for my feet. I was initially concerned that the toe aperture would cut into the top of my toes, but in use I do not seem to notice any discomfort nor develop blisters or chafing.
I am a normal UK adult shoe size of 8 1/2 to 9 1/2 (depending on manufacturer), and need a wide fitting. My Blue Finz state that they are UK size 8.5-9.5, EU size 43-44, USA size 10-11, also 270-275mm is written on the fins. The overall length is 340mm from the point of the heel to the tip of the fin, and they are 170mm across at the widest point. The actual foot space is 260mm to the end of the sole patch at the toe-tips, and 238mm to the edge of the opening over the toes.
And, yes, they have helped me find my crawl kick a bit more often. But there is a long way to go yet for me; the pool is not too keen on swimmers with fins, so before using them I have to wait until the lane is almost empty or the others are faster than me.
