bigger machine than normal, i'd assume an industrial one would work
such as
http://www.ebay.co.uk/itm/Industrial-sewing-machine-/180754997273?pt=UK_CraftsCollect_SewingMachines_RL&hash=item2a15d66019#ht_500wt_1178
though i wouldn't be suprised if an old husqvarna could do it as well, such as
http://www.ebay.co.uk/itm/Viking-Husqvarna-5530-/250931032770?pt=UK_CraftsCollect_SewingMachines_RL&hash=item3a6ca7b2c2#ht_500wt_1178
just make sure the neoprene isn't too thick, like 4mm+
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bigger machine than normal, i'd assume an industrial one would work
such as
http://www.ebay.co.uk/itm/Industrial-sewing-machine-/180754997273?pt=UK_CraftsCollect_SewingMachines_RL&hash=item2a15d66019#ht_500wt_1178
though i wouldn't be suprised if an old husqvarna could do it as well, such as
http://www.ebay.co.uk/itm/Viking-Husqvarna-5530-/250931032770?pt=UK_CraftsCollect_SewingMachines_RL&hash=item3a6ca7b2c2#ht_500wt_1178
just make sure the neoprene isn't too thick, like 4mm+