I was looking for some new running tops, so decided to pick up the Brooks Power Pro Tank. This tank is made with the new Equilibrium technology. Equilibrium technologies “are about thermo regulation, featuring advanced moisture transfer fabrics that regulate body temperature.” This Power Pro Tank features a T back & not the usual racer style back. This was the first time I had worn a T back & I was pleasantly surprised at how comfortable it was. I find that the racer back tops put added pressure on my shoulders, but not so with the T back. It was comfortable from the moment I put it on, & I could have kept it on for hours. My shoulders did not feel fatigued at all wearing this Power Pro Tank. It also has a built in bra, which gave me enough support while running. It has been working great at wicking away the sweat, yet making me feel dry. I am a heavy sweater & am quite often chafed by so called non chafing products. Not so with this Brooks Power Pro Tank. This Tank has tons of great qualities & I would recommend it to anyone who is looking for a change from the racer back style tops.