Cap-Ban-Nu™ Thin Cotton Knit Hat Size Reducer & Sweat Liner – Light Fit Adjustment

Make a slightly loose hat fit smaller with the Cap-Ban-Nu™ Thin Cotton Knit Hat Size Reducer & Sweat Liner. Designed for light fit adjustment, this low-profile cotton knit provides about ¼ size of reduction while absorbing sweat against the forehead. Its thin construction adds comfort without noticeable bulk.

Light Size Adjustment — About ¼ Size Smaller

The soft cotton surface rests comfortably on top of the existing sweatband, helping absorb moisture and protect hat interiors from sweat and makeup while providing a comfortable, low-profile barrier against the forehead.

Which hat size reducer do I need?

• Thin Cotton Knit – Light adjustment (~¼ size)
• Padded Cotton Knit – Medium adjustment (~½ size)
• Terry Cloth – Maximum adjustment (up to 1 size)

Key Benefits

• Light Fit Adjustment — Up to ~¼ Size Smaller: Ideal for hats that feel just slightly loose
• Low-profile Cotton Knit: Adds comfort without noticeable bulk
• Sweat Absorption: Helps protect sweatbands from moisture and makeup transfer
• Comfortable Barrier: Helps separate the forehead from the hat interior
• Easy application: Peel and stick directly on top of the existing sweatband

How It Works

Peel and stick the liner directly on top of the existing sweatband, where it rests comfortably against your forehead. Position it carefully before pressing it firmly into place. The thin cotton knit absorbs moisture while providing a subtle fit adjustment and low-profile comfort. Avoid repeatedly removing and repositioning the liner. When replacing it, remove it slowly and carefully.

Designed for light adjustment; for more significant size reduction, see our padded or terry cloth versions.

Best For

Slightly loose hats, baseball caps, work hats, delicate or vintage hats, and hats with interiors that feel itchy or uncomfortable against the forehead.

Quick Facts

• Fits most hat styles
• Designed to rest directly against the forehead
• Thin, low-profile cotton knit 
• Designed to be applied once and left in place until replacement is needed

Product Details

• Material: 100% Cotton Knit
• Adjustment level: Light (about ¼ size)
• Colors: Black or Cream
• Self-adhesive backing
• Individually packaged
• Made in the USA
• Non-returnable (hygiene product)