Not a "must".......playingthe wind correctly is a MUST! But in bowhunting it's all about confidence,if you feel more confident spending your hard earned money on a "magic" suit then more power to you. I think by managing your scent with regular hunting clothes and playing the wind correctly you will see more deer and have more shot ops. Keep your scent off the ground on the way to and from your stand and you will see deer all season.................don't waste your money on scent loc.