MONROW Thermal Sweatpants in Gray. - size XS (also in ) MONROW Thermal Sweatpants in Gray. - size XS (also in ) Cotton blend. Elasticized drawstring waist. Thermal knit fabric. HARL-WP437. HB0333. Launched in 2007 as a basics label, Monrow has quickly risen to the top. Designers Michelle Wenke and Megan George have created a line of fundamentals-quintessential wardrobe staples with attention to fit, fabric, technique and innovative prints.