Typically sale at Walmart for $17 each. Stay fresh and dry during your period with these NWT super-absorbent, leak-resistant, odor-trapping panties that are easy to clean in the washing machine. Made from stretchy organic cotton with four-layer technology, these panties are designed to replace period products on moderate- to heavy-flow days and serve as backup on heavy days. Style Name:Thinx (Btwn) Shorty Period Underwear. This listing is for a set of 8. 4 Navy Blue and 4 Gray. Size: 13-14 years old but equivalent to a Women’s small (US Size 4). Waist 26-27” and Hips 36-37”. See measurements in photos. Absorbency capacity: The underwear holds up to 45 mL, equivalent to 5 tampons of liquid. Material: The garment is constructed from organic cotton.