This variety pack gives you the best of three worlds-- one pair each of our Lightweight, Middleweight, and Heavyweight pad inserts! All BKKP pad inserts are the same 3/8" thickness; the difference is in density. The Lightweight pad inserts feel comfortable immediately, but break in quickly. The Heavyweight pad inserts offer the most protection, but take some time to break in. The Middleweight pad inserts are our Goldilocks offering-- right in between... and Bee's personal favorite. Test them out and find your comfort! Refresh your Bee's Knees by replacing the inserts as often as you want.