Competition Inc. Men's Collar Extenders Wonder Buttons, Silver (Pack of 4) | Jet.com
Wonder Button - expands the size of dress shirt collars up to 1/2 inch. For example: a size 16 dress shirt would expand to a 16 1/2 size. Never worry about your shirt collar feeling too tight again. The exclusive Wonder Button is a small button attached to a small expandable stainless steel spring loop. Place the small button into the button hole of your dress shirt collar. Next, place the small loop over the dress shirt collar button. Made to last. This is a patented item with a lifetime guarantee from the manufacturer. The Wonder Button makes dressing nice a comfortable experience. May also be used on dress shirt cuffs creating expansion at your wrists as well. Made in the USA.