Microfiber towels from amazon. Love them so much I just bought more:

Hope Shine Microfiber Sports Towel Soft Travel Towels Fast Drying Gym Towels 3-pack 16inch X 32inch (Dark Blue+light Blue+grey) https://www.amazon.com/dp/B014VXDOOU/ref=cm_sw_r_cp_api_i_jXbpCb309XP2V