It's nice that several companies are trying to make something like this, but they still need a lot of improvement before it can be called a great product . Here's my feedback as a former runner still trying to run as fast as possible after 60-mile weeks and limited training: It's not ideal to place the belt near the diaphragm where it's just uncomfortable, and it also interferes with any heart monitor strap you might be - this causes shirts and jackets to ride up a little which causes chafing - this obviously keeps the clothes snug against the body which causes more sweat - it's not easy to clean when it is sweaty and stinks - unless you're also a size small, the hose dangles a bit around the waist and catches slightly swinging hands as you run (need to use zip ties at the back to make the hose tighter and closer to the body) - the module appears unnecessarily large - the clips holding the tube in place will damage the tube over time. It would be great to just have a snorkel that could wrap around the shoulders and waist of a regular light weight reflective vest with a small battery box that attaches to pants/shorts. However, as far as I know, this product doesn't exist yet and this might be the best option we have at the moment.
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