Review on 🏋️ SATKULL Training Mask: Boost Cardio and Fitness with 24 Breathing Resistance Levels for High Altitude Training and HIIT Workouts by James Townsend

I've had other similar masks that were operated with a single lever. Usually one to four. With each setting, you can feel the difference in air restriction. With this mask and its dual levers and fiddling with the silicone pads inside, finding the right configuration becomes a chore. I actually couldn't find a setting that worked for me, so I ended up cutting one of the white silicone inserts to a smaller diameter and it worked for me. For the price I can not recommend. But YMMV