I received this question from a reader:
Which are better, plastic or metal collar stays?
This is what I shared with them:
Collar stays are inserted into the points of your collar to strengthen the fabric. Over time, even if you remove the plastic stays before they go through the rigors of being laundered, they may bend enough that they no longer have the stiffness necessary to maintain the collar’s strong V shape. Metal stays are less flexible than plastic ones, so do not bend as easily.
If you’re trying out metal stays, consider magnetic ones. They’re a great option for collars that don’t have stay pockets (such as polo shirts) and occasions when you want to precisely control the collar presentation.