Got a couple of the Black Diamond Vario Harnesses this year. My 15 year old and I tried them out this weekend on the first hunt of the season. Super easy for him to clip right into the prussic knot and climb up safely.
https://www.blackdiamondequipment.com/en_US/web-specials/vario-speed-harness-BD6500720000ALL1.htmlReally like them compared to the HSS we used to use. They also feel so much less constrictive on your upper body compared to the HSS, especially for bowhunting.