i had a 10lb weight vest that got used by my sons for running. i stopped using it because um YUCK (sweat). it looked like a bullet proof vest and it was starting to fray a bit. when i saw this vest it had so much less body coverage yet it was 2lbs heavier. i loved the way it fit and the material. it's very flexible and it feels like neoprene. the extra 2lbs really makes a difference too! i've only used it for walking so far, so i don't know how comfortable running in it would be. the strap across the chest might be irritating because it's necessary to have it tight to keep from slipping. i plan on using it for stairs and squats also so it shouldn't be a problem for me.
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