What federation are you lifting for? Some have requirements of "single ply only " like the USPF, then you have the IPA who lets ou use whatever you have whether it be single, double, hydraualically enhanced...giggle If you are allowed a double ply suit, I would do that rather than the groove briefs. I only have one world record and 3 state records in powerlifting, so my advice may not hold as much water as some of the guys on here...
SPF, SSA, APF (I know its multiply only, but they have several meets through the year relatively close by), SLP, and a couple of other federations all have meets within 300-400 miles (short roadtrip) of where I live throughout the year. The gear I use now is all single ply. I'm not at a point where I want to upgrade to multiply. If I can get everything straight with work, I'm thinking really hard of doing at least one full SPF meet this summer and/or fall. That's where the single ply breifs would be used if I can find a pair I like and am comfortable in.
Also, I'm not looking for leggless "groove" type briefs--I nearly sterilized myself with a pair of Inzer groove briefs and a wandering testicle. I don't want that to happen again. I'm looking for something like powerpants or single layer predators. I just haven't found any, so if anyone knows of a company making them, help.
Thanks.