The Long Johns (100% polypropylene) help relieve muscle strains in the hip and groin region and also bladder and prostate pain brought on by the cold. We have seen a positive effect with both hip pain and pain in the tensor fascia latae thigh muscle. The Long Johns do not sit too tightly, so they are also ideal to use as thermal underwear during the winter or as a base layer all year-round.
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The pants are unfortunately too short over the hips, I have the bending over the feeling that the pants slip over his butt.
8 out of my 10 hour day is outside all year. Low temp is only 30; however I feel enough of a rise in body temp that I no longer wear 2 sets of Long Johns. These work 100%.