The Hori Nintendo Switch Joy con grips were bootylicious; https://www.youtube.com/watch?v=EpzAPJFwu2g BUT the ORZLY FlexiCase Joycon Grips are EVEN MORE BOOTYLICIOUS!
Also, the best two player mode Joy con grips; https://www.youtube.com/watch?v=CRjCaETJf_Y
Orzly FlexiCase Quad-Pack for Nintendo Switch Joy-Con Controllers – Blue / Red
“The lightweight, super slim way to protect your Joy-Con Controllers from every day wear and tear, the protective FlexiCase is a secure and convenient way in which to carry your handset with minimal affect on weight or bulk. Whilst the material is flexible enough to make fitting around your controllers extremely simple, we have specifically designed it to be hardwearing and durable so that it offers extra protection for your controllers against bumps & knocks. Its non-slip texture helps to maintain a comfortable, soft grip when holding and ultimately helps to prevent drops.”