Pneumatherm - one of 3 or 4 prototype devices that alternate hot and room temperature air to improve circulation in tissue at greater depth.
Study published in the Journal of Orthopedic and Sports Physical Therapy, July 2004: "Effect of Heat Modalities on Hamstring Length: A Comparison of Pneumatherm, Moist Heat Pack, and a Control.
Conclusion: "Our results demonstrate that the Pneumatherm modality is an effective agent for increasing hamstring muscle length following a single 20-minute treatment."
$30 for Pneumatherm machine + $30 for case. Can be purchased separately.