Our concept for evolution tracks uses two techniques for the concertina folding :
1  the classic  method of folding using a sewn folding strip.
2  a self-adhesive extra-wide (100 mm) connecting and folding strip.

advantages of this technique:
they can be used as a mono-block track when kept in one connected stack.
they are lighter and easier to handle if you separate the elements (it is easier to transport 3 tracks of 4m than 1 of 12 m).
it is possible to construct a made-to-measure  length according to your needs.

concertina foldable tracks to make linear evolution strips, two coloured, lateral strips, velcro at the ends.
track of 4 x 1 m
foldable in two (5,5 cm thick).
dimensions when folded : 2 x 1 m, 11 cm thick.