My preschool daughter wears these tights to step/ballet class every week. She often stays in her dance gear all day and then I toss her in a laundry bag along with her leotard and throw them in the washing machine with my regular detergent. I think they lasted like 2-2.5 months before a small hole formed (maybe after visiting the playground). Compare that to the 3 packs of $5 panty hose I bought from Target where each pair lasted 1-2 uses max. They cost more, of course, but are significantly higher quality garments.
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