Stay warm and focused in cold-weather conditions with the Grundens Grundies Thermal Bottom, a fishing base layer designed to retain body heat while remaining breathable. Made from soft, non-pilling thermal fabric, these bottoms provide insulation without adding bulk, making them ideal for layering under your fishing or outdoor gear. The moisture-wicking technology manages perspiration, while HeiQ anti-odor treatment keeps you fresh during extended wear. UPF 50 sun protection guards against harmful UV rays, and the elastic waistband ensures a snug, comfortable fit. Flatlock seams and a gusseted crotch enhance mobility and prevent chafing, ensuring all-day comfort in any outdoor activity.

• 50% nylon/41% polyester/9% spandex with brushed back
• Thermal base layer performance bottom
• HeiQ anti-odor technology for extended freshness
• Moisture-wicking technology to keep you dry
• Full elastic waistband with flat drawcord
• Zippered hand pockets
• Self-fabric jogger-style cuff
• Crotch gusset for comfort
• 3M reflective logo
• UPF 50 sun protection
• Imported

MADE WITH PFAS CHEMICALS

Prop 65 Warning

Made with PFAS chemicals

This item cannot ship to California or New York.