Frequently Asked Questions
Everything you need to know about our seamless performance gear.
How do I choose the right size for runderwearTM products?
We recommend referring to our comprehensive size guide located on each product page. Our seamless technology provides a snug, athletic fit, so if you are between sizes, we generally suggest sizing up for maximum comfort.
What makes runderwearTM different from standard athletic underwear?
Our products are specifically engineered for runners, featuring 360-degree seamless construction to eliminate chafing, moisture-wicking fabric to keep you dry, and breathable micro-perforations for optimal temperature control.
How should I wash and care for my performance gear?
To maintain the integrity of the technical fibers, we recommend a cool machine wash at 30°C (86°F). Avoid fabric softeners and tumble drying; instead, hang your runderwearTM to air dry.
What is your return policy for hygiene-sensitive items?
We offer a 30-day return window for all unused and unopened items in their original packaging. For hygiene reasons, we cannot accept returns on underwear that has been worn or removed from its sealed hygiene strip.
Do you offer international shipping?
Yes, we ship runderwearTM worldwide. Shipping costs and delivery timelines vary by destination and are calculated at checkout. Express shipping options are available for most major regions.
Are your products suitable for ultra-marathons and long-distance events?
Absolutely. runderwearTM is designed and tested by ultra-runners specifically to prevent friction and blisters over extreme distances, making it the ideal choice for marathons, trails, and triathlons.