NSF Aria Thermal Tee in Turquoise. - size XS (also in ) NSF Aria Thermal Tee in Turquoise. - size XS (also in ) Cotton blend. Thermal knit fabric. Banded cuffs. Frayed curved hem. Made in USA. NSF-WS255. 20136 SLBH. Based out of California, NSF has caught the eye of many. With their clean design and boyish charm, NSF is recognized for its relaxed, modern style looks.