I live in Phoenix, Arizona, which has a very extreme climate, especially in the summer where temperatures in the desert reach over 110 degrees frequently and lows are in the 80s and 90s. I've been exclusively using PATH running clothes since September of 2020 in all of my training for the Man Against Horse 25 mile race, The Squaw Peak 50 mile race and the Mogollon Monster 100 mile race. The gear performed flawlessly. The Tahoe base liner combined with the Sykes shorts were comfortable and gave me ZERO chafing issues. The Circle Range short sleeve shirt was extremely comfortable and wicked away moisture well. I've been mountain running since 1993 and this gear is by far the best I've ever used.