Swim gloves - Any good?

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I've been attending Aqua Fit classes for a good few weeks now. Last session the instructor doled out the swim gloves (1st time). Not sure how effective they actually were as I had to keep stopping every couple of minutes to refasten the velcro. Just hoping to get a few thoughts from folk who use them. Are they a waste of time or are they actually worth it?

I checked them out & a website suggested they improve resistance/training by 50-100%. Was rather sceptical as the site was selling them though :huh: