Mega fit mega is the sidi version of wide fit buying the mega version gives you the following 4 mm wider across the ball of the foot more volume a high instep and a wider heel cup mega lasts are ee o eee width the techno 3 system dials in fit along the entire length of the shoe adapting the upper to the shape of the foot for a customized fit sidis famously reliable and replaceable closures are improved by an all new proprietary sidi wire material that is completely nonbinding for int