
Groomsmen gifts have a way of collapsing into the same three ideas: a flask, a pocket knife, a set of cufflinks nobody wears twice. If one of your guys spends his autumn weekends in a deer blind rather than on a golf course, there is a far better option, and it costs about the same as the flask. A leather arm guard.
What It Actually Does
An arm guard, or bracer, straps to the inside of the forearm on the bow arm. It has two jobs. It keeps a loose sleeve from catching the string, and it takes the string slap that otherwise lands on bare skin. Anyone who has been hit properly will tell you the bruise lasts a fortnight and the flinch it teaches you lasts longer.
It is one of the few pieces of archery kit that is genuinely universal. It does not need to match his bow, his draw length, or his budget. It just needs to fit his arm.
Why Leather, Specifically

Plastic and mesh guards work perfectly well and cost very little, which is exactly why they make a poor gift. Leather is the version worth wrapping. It softens and molds to the arm over a season or two, it takes tooling and initials, and it ages into something with a bit of history rather than something that cracks and gets replaced.
For traditional shooters running a recurve or a longbow, leather is also the correct answer aesthetically. A hand-finished leather arm guard sits right next to a wooden bow in a way a strip of vented nylon never quite manages.

Watch: Archery | Do You Really Need An Armguard? (YouTube)
Choosing One Without Asking Him

You want the guard on his bow arm, which is the left forearm for a right-handed shooter. Beyond that, three things matter. Length: short guards cover the wrist end of the forearm, long ones run most of the way to the elbow and suit longbow shooters whose string tracks higher. Fastening: elastic straps or buckles, with buckles looking better and elastic being quicker. And thickness, where heavier leather protects more and breaks in slower.
An adjustable mid-length guard fits almost anybody, which makes it the safe pick when you are buying without a fitting.
Why It Lands Well
It is useful, it is personal, and it is the right price for a groomsman rather than a best man. Add his initials and it stops being gear and starts being a keepsake he straps on every opening morning for the next twenty years. That is a better run than any flask on the shelf.