The liner only has seams around the elastic on the sides.
The insoles are pretty standard. But the plastic that wraps around the bottom half of the shoe gives a lot of arch support all the way to the top of the arch, not just under the foot. It's primary purpose is aerodynamics but this is a nice side benefit. There's no reason you cannot put in aftermarket insoles, but you may find that adding to the existing arch support would be too much, but that's just a guess.
Thanks a lot for the kind words!
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Ed O'Malley
www.VeloVetta.com Founder of VeloVetta Cycling Shoes
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