Certified by the Swedish Rheumatism association, tested according to The Design for All Test, published in the Swedish Design Research Journal, 2011.
Certificirano s strani združenja Swedish Rheumatism Association, testirano v skladu z načrtom za oblikovanje testov, objavljenim v reviji Swedish Design Research Journal, 2011.
Na osnovi notranjega panelnega testa ponovnega polnjenja mila z merjenjem časa.
based upon durability testing