In the world of custom men's shirts, it's pretty much a necessity that the collar and cuffs must be firmer than the rest of your shirt.
Underlines different width varies, because some companies created from fabrics like canvas and others made of a synthetic material similar to dryer sheets. It's really not a bad thing because the rock-hard collar is not always pleasant. You can buy the best custom shirt from https://alleghenyapparel.com/ or from other online sources.
Take for example; if you go on a first date with a collar that looks bulletproof, you can appear to be too strong. On the other hand, you do not want to walk into a meeting room or an interview with a ruffled collar.
But beyond the quality and thickness, the people who prefer collared shirt company was quick to say that the way interlinings closed makes a difference to the way your collar to be seen in the coming months. Some interlinings are "coupled", meaning pasted directly on the fabric to provide a more rigid surface feel. "Not set" collar leaves a gap between the fabric and lining.
People who have more time to iron the clothes they could do better with a collar inserted at, which is not the level of wrinkles can bend even with rough contraction of the underscore and shirts.
When worn without buttoning a shirt made, the collar does not get ruffled and help provide clothes that look good even in a relaxed situation. Dress shirt collar that is not combined better look when worn with a tie to make the neck look together but not too tight.