The Hollis DSMB (Delayed Surface Marker Buoy) with Sling Pouch is reviewed by Jeff Goodman. This product is designed for divers to safely signal for surface support during a dive. The Sling Pouch allows for easy attachment and transport of the DSMB. It’s a valuable tool for both novice and experienced divers to enhance safety while diving. Overall, the desk suggests that this gear is an essential addition for any diver looking to improve their safety measures underwater.