Hollis has become a leader in the sidemount market. It is not just a fad and not just a tool for cavers, it's here to stay and is growing. The SMS 75 is an evolution from years of sidemount development. While it will cater more to hardcore cave divers, SMS 75 was created to handle all environments. Proper trim is key, and the wing is designed to promote horizontal diving with increased lift towards the hips where it's needed most. The SMS 75 will also support rear-mounted tanks and reversible inflator positions.