I upgraded from charge 2 to charge 4 and bought this strap to wear on my ankle. I can immediately see the difference in the design of this strap and the ankle strap I used to charge 2. I bought it from another seller under a different brand name and had to replace it 3 times in 9 months because of the strap. stretches and the loop (not the sticky side of the velcro) snaps like cotton candy. This group seems to be much better constructed. I think it will take much longer. I bought a medium one and the ends overlapped a bit. The velcro stuck to the outside of the strap, but the overlapping edge rubbed against my skin and was uncomfortable. Now I'm keeping it loose enough that I can easily slip my toe between my foot and the band (which I think you should be doing anyway). I haven't experienced any chafing or irritation and I hardly know what it is. I would buy it again.
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