Quick answer
For most rides, wear padded bike shorts or bibshorts without underwear—the chamois is designed to be worn against the skin. If you prefer extra support or are wearing baggy shorts, choose a thin, seamless liner short with a pouch, like BN3TH's Pro Ultra Liner, instead of regular cotton underwear. Always test your setup on short rides before going long.
Understand the role of the chamois
Bike shorts and bibshorts include a chamois (pad) that cushions your sit bones and reduces friction. The chamois is meant to be worn directly against your skin. Wearing regular underwear underneath adds seams and fabric that can bunch, trap moisture, and cause chafing. If you want extra support or modesty under baggy shorts, use a dedicated liner short instead of everyday underwear.
Choose the right base layer for your ride
For road cycling and long efforts, go without underwear and rely on your bibshort's chamois. For mountain biking or commuting in baggy shorts, a liner short with a chamois provides padding and support. BN3TH's Pro Ultra Liner Short With Pocket and Pro Ultra Liner Tight With Pocket are designed for athletic movement and feature The Original 3D Pouch for separation and support. If you play hockey, the Pro Hockey Jock is a specialized option with a cup pocket, but it's not intended for cycling.
Check fit and seams before you ride
Your base layer should fit snugly without being restrictive. Seams should lie flat against your skin—ideally flatlock or minimal seams. BN3TH liners use super-premium, lightweight fabric that's breathable and silky smooth, which helps reduce friction. Avoid cotton underwear; it holds sweat and stays damp. Before a long ride, do a short test ride to ensure no bunching or pressure points.
Step-by-step layering guide
- Start with a clean, dry base layer: Shower and dry thoroughly before putting on your liner or bibshorts. Moisture and bacteria increase chafing risk. Never reuse a damp liner or bibshort from a previous ride.
- Apply anti-chafe cream if needed: For long rides or sensitive skin, apply a thin layer of chamois cream to your skin or the chamois. This reduces friction. Skip cream if you're using a liner with a pouch that already minimizes contact.
- Put on your liner or bibshort: If using a liner, pull it on like underwear, ensuring the chamois is positioned correctly. If using bibshorts, pull them up and adjust the straps. The chamois should sit flat against your body without wrinkles.
- Add baggy shorts if desired: For mountain biking or commuting, wear loose-fitting shorts over your liner. Avoid shorts with thick seams that can rub. Choose shorts with a smooth inner lining or no liner at all.
- Adjust and test: Do a few squats and pedal strokes to check for bunching or pressure points. Make adjustments before you start riding. If you feel seams or folds, readjust or change your base layer.
Product facts
- Pro Ultra Liner Short With Pocket: Black: The award-winning Pro Ultra liners are built for maximum training and elite performance, crafted from super-premium, lightweight fabric that’s highly breathable, supportive, and silky smooth. Designed with The Original 3D Pouch, it keeps everything separated and supported for next-level comfort during intense movement. A fold-over secure pocket provides reliable storage that stays in place while you move. This liner short can be worn under baggy shorts instead of underwear, offering support and a secure pocket for small items without adding bulk.
- Pro Ultra Liner Tight With Pocket: Lucas Beaufort - Black: BN3TH partnered with runner and artist Lucas Beaufort on the Pro Ultra Liner Tight with Pocket to fuse real performance needs with his deep connection to movement. While inspired by running, the liner is built for all athletic pursuits, delivering versatile comfort and freedom across training, gym, and high-output activities. The Pro Ultra is built for maximum training and elite performance, crafted from super-premium, lightweight fabric that’s highly breathable, supportive, and silky smooth. This tight liner offers the same performance fabric and pouch support in a tight fit, suitable for cycling and other high-output activities under shorts.
