Triad Tactical stock pad
https://triadtactical.com/triad-stock-pad/The inside is all loop, and the straps plus spacers are all hook&loop. You set up the comb height and strap location where you want and it all stays together.
They also make them as a stock pack, if you want the comb height plus a spot to store ammo and a DOPE card.
I use the Brown stock pack on a Rem700 Classic, and while the look of ballistic nylon isn’t “classic”, it’s not obnoxious.
Mine has gone through multiple long hunting seasons and looks virtually brand new, so they’re built well.
