This Belleville Tactical Research 7' Ultralight Tactical Boot TR1040-T is the 10-40 Series and engineered to provide maximum comfort and support without the weight of standard duty boots. At the core of the new series is the PTO orthotic foot-bed; a proprietary, load-bearing removable insert that uniquely combines the benefits of a shock-absorbing foam with superior arch support. The 10-40 Series is the new benchmark for light, fast, engineered tactical boots.