Pod Harnesses are said to improve the performance of you glider by perhaps 0.5 or more on glide. Mainly for XC pilots, they come in a variety of styles and weights. With pod harnesses, it is essential to get a good fit, and best to try the model and size you want before you buy. Generally, pod harnesses are suited to pilots of some many years experience, who have good wing control, as most gliders are NOT certified or tested with this type of Harness. They can cause control issues in yaw, so best left to those who have done quite a few seasons, and who will get the benefit of warmth at base and a better inter-thermal glide.