Seams on sides - because side seams are supported by the bed, not pulled apart by it
No extra vinyl at corners- not needed due to exclusive weld technology, extra layers induce their own stress points
Vinyl Products has superior testing:
Exclusive Flex-Test by Vinyl Products
The Flex-Test testing device ensures any vinyl we uses is strong!
The Volatility Test insures long life from heated mattresses, it supports the the concept of our special vinyl which has superior plasticizers which cost more but result in a better
mattress with longer life