New Air| Boost Trunk with Lifting Sling. Meet the latest collection from Jack Adams, the Air| Boost Collection. Design for 360 degree fit and function for all day comfort. Stay cool with the open mesh fabric and a pouch design to allow more room as well as a built-in lifting sling for pouch enhancement. No adjusting, picking, or pulling. Due to the design, it is recommended that guys with larger legs and glutes to consider going up one size for added comfort.