That small piece is commonly called the top button or cap button. On Walmart, you’ll see it described as a baseball cap top button or hat button replacement. Many replacements are cloth- or fabric-covered with a metal shank and a matching back piece, while others use lightweight aluminum. They’re available in popular sizes like 0.55 in (≈14 mm), 0.6 in (≈15 mm), 0.67 in (≈17 mm), and 0.75 in (≈19 mm), often in single-color or mixed packs. Choosing the right style and size helps the button sit securely and blend with your hat’s look.

1. Match the size and style: Check your old button’s diameter and choose a similar cloth-covered or aluminum set. Many kits are no-sew with a back rivet.
2. Remove the old button: Carefully twist or separate the old pieces so the center eyelet is clear.
3. Align the new button: Insert the button’s shank through the cap’s center eyelet from the outside.
4. Attach the back piece: Press the parts together firmly. A cloth between pliers and the button can help protect fabric.
5. Test the fit: If it wobbles, re-press gently.

Always follow the product’s instructions. Working on a stable surface can help, and results may vary based on the cap and kit used.

For most caps with a standard center eyelet, using a no-sew replacement set can feel approachable, even for beginners. Many kits include a cloth-covered button and a metal back that snaps or rivets together with hand pressure or light use of pliers. The process can often be done in a few minutes, but difficulty varies by hat thickness and fit.

• Match size: Common options include 0.55", 0.6", 0.67", and 0.75".
• Pick your style: Cloth-covered or aluminum, depending on the look you want.
• Check the eyelet: If it’s damaged, professional help may be preferable.

Review each item’s instructions and photos before starting.

If you’d prefer not to DIY, a local alterations shop or tailor can typically install a replacement button. Some customers also pick up a hat button kit and ask a repair shop or a craft-savvy friend to attach it. Bringing the cap and a correctly sized button (commonly 14–19 mm) helps match the fit.

You’ll find fabric-covered and aluminum replacement options on Walmart. Service approaches can vary by shop, so it’s a good idea to confirm their installation method and what parts they’ll need before visiting.

Measure the diameter of your existing top button (or the visible center eyelet) to choose a close match. Popular sizes on Walmart include 0.55 in (≈14 mm), 0.6 in (≈15 mm), 0.67 in (≈17 mm), and 0.75 in (≈19 mm).

• Between sizes? Consider a mixed pack with multiple diameters.
• Installation style: Match the shank-and-back-piece setup or aluminum style your hat can accommodate.
• Finish and color: Cloth-covered buttons blend with caps; metal offers a polished look.

Checking the product photos and specs can help you pick a size and style that suits your cap.