I bought these tights because I believed that they would help me successfully hike to the Tiger's Nest Monastery in Bhutan. The joint control on the tights literally saved my knees from any kind of soreness or loss of motion. Besides the uphill climb to the first look out point, there were a total of 1500 steps both up and down that were necessary to climb in order to get to the monastery at 10,000 feet. My hips hurt at the end, but my knees were spared. I attribute this lucky outcome to the construction of these wonderful tights. I highly recommend these tights. They are also comfortable and lightweight. I purchased the thermal ones, and I was as warm as can be in Bhutan in November.