Selecting this service is absolutely a must, particularly because there's really no good way to know which DLTA pods, and how many, will be needed to fit a helmet properly to the athlete. It's completely a "trial-and-error" exercise, requiring the fitter to have a multitude of pods on hand to swap in and out. I bought way more pods than I thought I would need and knew from the start I'd be returning things. I ended up returning 2/3 of the pods I bought, as expected.
