The ASICS Women's Thermopolis 1/2 Zip is a versatile and functional base layer top for women's running. It is made with a soft and lightweight fabric that provides warmth without adding bulk. The 1/2 zip design allows for easy ventilation and temperature control. The thumbholes keep the sleeves in place and provide extra coverage for your hands. This base layer top is highly rated and a popular choice among women runners for its comfort and performance.