Returning the sleeves.
Returning the sleeves is very difficult. I tried to return after experiencing pain over the first four days after trying them.I was told in very ingratiating language that the 30 day trial was not a choice. One must use them for 30 days. So at 30 days I tried to return again. After receiving the same rote replies about checking for proper size and fit, the responses to my emails from Koprez just stopped. I had to contact my credit card company to begin a dispute. ( They told me they had had other Koprez complaints.) The credit card company refunded the cost and I also sent back the sleeve. Buy from this company with great caution!