These cooling fabric neck coolers can range in length from 33" to 45", depending on the specific fabric. There is a chamber in the middle which holds water beads, that once hydrated, stay hydrated for days. To hydrate, place neck cooler in cool water for about 15-20 minutes, then in the refrigerator or in an ice bucket. The cooling should last for 30-45 minutes. To dry, hang on a clothesline or place on your dashboard.