This is one of the most underrated positions in BJJ. In Gi Jiu-Jitsu, this position is one of the best for opponents that have a large size differential, though the lack of usable sleeves in No-Gi makes it less advantageous there. The person on bottom controls both of their opponent’s arms at the sleeve, and they have each foot in the bend of the opponent’s arms. Positioned like this, the top person loses a significant amount of their weight advantage, as well as being severely limited on the control they can get from grips and arm strength.
Depending on the grip style, this position can be especially hard on the finger joints of the person on bottom. It is recommended that special care be taken to protect the fragile finger joints if this becomes a regular position in your arsenal.