Comfortable Fit with Ease for Men & Women: Struggling with tight shirt collars or cuffs? C2 Collar and Wrist Extenders (cufflinks) instantly add extra room - no sewing or tools required. Just fasten and go for a more relaxed, tailored feel throughout the day. Package Includes: 5 easy-to-fasten mixed-size white & black buttons designed for versatile use and a personalized fit. 2 Small (ideal for subtle, stylish changes to collars or cuffs with a very slight size increase), 2 Medium (add about 2 sizes-perfect for expanding tight collars or cuffs), and 1 Large (offering approximately 3 sizes of extra room, for maximum comfort or as a central button replacement around the chest or belly). These extenders provide flexible solutions to fit your needs. Adds Extra Space: Each extender adds 1.3-2.5cm (0.5-1in) of extra room, depending on the loop size. Designed to fit buttons with a 10.2 mm (16L) diameter. Note: measure your shirt button to ensure fit, as sizes vary and consider three key factors before purchasing: 1. button size (diameter), 2. loop length (how much extra room you need), and 3. color/design. No Rust, No Warping: Metal extenders can rust your shirt if left on during washing. They also lose their shape quickly and can become deformed. On top of that, metal can be uncomfortable against the skin. Our elastic button extenders are a better choice - they don’t rust, don’t deform, they are soft and machine washable for long-lasting comfort and convenience. Patented Design Made from Recycled Materials: Our patented, high-quality button extender offers a smarter, more comfortable alternative to generic options. Each piece features a durable, flexible elastic loop paired with a premium recycled resin button, designed to withstand daily wear and washing. A sustainable, reliable upgrade for your shirt. Need help choosing? Scroll down to view the full size guide and comparison chart to find your best fit.