Rothco Midweight Thermal Knit Bottom Large Black. The thermal bottoms are lightweight breathable super warm material which makes them an ideal base layer. Rothco's thermal base layer bottoms feature a soft elastic waistband and comfortable tagless label. Matching midweight thermal top also available. Specifications for Rothco Midweight Thermal Knit Bottom: Manufacturer: Rothco Gender: Male Age Group: Adults Application: Active Cold Weather Outdoor Color: Black Fabric/Material: 60percent Polyester 40percent Cotton Apparel Fit: Perfect Seasonal/Temperature Use: Cold Weather Features of Rothco Midweight Thermal Knit Bottom Material: Polyester Material Specs: 60percent Polyester / 40percent Cotton Package Contents: Rothco Midweight Thermal Knit Bottom Rothco 2837-375: Midweight Thermal Knit Bottom Large Black