Long-sleeved performance base layers mid tech T-shirt with round neck with a warm-touch inner layer. Breathable, high-strength fabric. This garment has been tested to withstand temperatures from +12ºC (low activity) to -8ºC (moderate activity) during a standardised test with simulated wind of 0.4m/s wearing a jacket, trousers, underwear, socks, shoes, gloves and a knit hat.