They’re most often called race bibs, bib numbers, or competitor numbers. These identify you on course for timing, photos, and results, and they’re usually worn on the front of your top.

• Attachment: Typically pinned at the corners or clipped to a race number belt (bib holder).
• Sizes: Common options include compact (around 7x4 inches) and larger formats for easier visibility.
• Materials: Many bibs are designed to be durable, with tear-resistant or water-resistant construction.
• What you’ll find here: Blank and pre-numbered bib packs, safety pins, bib clips, and adjustable belts for running, marathons, and triathlons.

Always follow your event’s rules for placement and visibility.

For official races, your marathon number is assigned by the organizer and provided at packet pickup or mailed before race day. If you’re training, hosting a fun run, or need extras for a group, you can purchase race bibs and holders here.

• Organizer process: Watch for email instructions, pickup times, and ID requirements.
• Buying bibs: Choose pre-numbered ranges (e.g., 1–50, 1–100, up to larger sets) or blank bibs to customize.
• Attachment options: Packs may include safety pins; belts and bib clips are available separately.

For sanctioned events, only the official issued bib is typically valid—always follow the race’s guidelines.

Both work—your choice depends on comfort, convenience, and event rules.

• Safety pins: Simple and reliable. They’re low profile and included with many bib packs, but they can leave small holes in technical tops.
• Race number belt (bib holder): Clips the bib without pinholes, makes on/off easy, and stays visible over layers. Some belts include gel loops for fueling during marathons or triathlons.

Consider your shirt fabric, weather (layering), and whether you’ll need quick transitions. Whichever you use, attach the bib evenly so it doesn’t flap and confirm visibility matches your event’s rules.

Pick a size that’s easy to read and fits your top without bunching.

• Compact (~7x4 in): Good visibility with a smaller footprint—helpful on slim-cut singlets.
• Standard/Larger (~7.5x6 in or 7x6 in): More number space for readability, often preferred for organized events or when layering.
• Kids or small events: Compact sizes can feel more comfortable on smaller frames.

Check your event’s specifications (some races specify size and placement). At home, hold a sheet to your chest to gauge coverage and test where pins or clips will land. You’ll find multiple sizes and formats here to match your needs.

Race number belts are typically reusable, while bibs are usually single-use for official events.

• Bibs: Organizers assign specific numbers; most events require the official bib issued for that race. Durable bibs may hold up for practice or casual runs, but always follow event rules.
• Belts: Reusable and adjustable. For care, spot clean or hand wash with mild soap, then air dry. Avoid high heat to protect elastic and clips.
• Storage: Keep unused bibs flat and dry; store belts untangled to preserve elasticity.

When in doubt, review the race’s policy on bib use and placement.