Sonia Sweatpant Sonia Sweatpant 95% modal 5% spandex. Made in USA. Machine wash. Elastic waistband and drawstring. Fleece knit fabric. Item not sold as set. SPLR-WP163. E2077. High-performance is apart of the Splits59 brand DNA. The LA based line is full of innovative activewear for women that blends advanced fabrics with sleek silhouettes. With features like quick-dry sport performance fabrics, flat seams, fluff threads and plush elastics each piece is design to keep you looking fabulous and feeling great while going the extra mile.