Birkenstock unisex-adult Birko Sport Arch Support, Blue, 41 M EU / US Men 8-8.5 M / US Women 10-10.5 M Sleeping Masks 33 fl oz (10 ml)

33 fl oz (10 ml) multi-dose bottle and can be used either as part of our 3-step heat

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Birkenstock unisex-adult Birko Sport Arch Support, Blue, 41 M EU / US Men 8-8.5 M / US Women 10-10.5 M Sleeping Masks 33 fl oz (10 ml)The BirkoSport two part system combines a BirkoCork? arch support, made from cork and EVA, and a shock absorbing BirkoCell EVA foam top layer. Proper arch support helps distribute impact, absorbing shock and stabilizing the foot with every step. You can wear the layers together or separately to suit your comfort needs.