Antlion itself an official wireless modmic, but it's a staggering 150 bucks, was cheaper a could years ago... On the upside, it's pretty much a lifetime purchase and really good quality. But it's definitely overpriced.

If your budget is lower, you can look at lavalier mics or wire mics. Those are the kind that TV/ video guys usually wear. Lavaliers are simply tacked to the top of your shirt, while the wire mics are super thin wires that you wear under your actual headset. Both are light, have good audio quality and nur importantly are available at much wider and fairer price ranges, as they are less of a nice. Lav mics can be as cheap as ten bucks.