Parasuit requires very close, with elasticity in joints parts to easy to stretch.
Gliding suit is relatively loose. For winter use, fabric is waterproof and warm; for summer use, fabric is permeable and comfortable.
To ensure security, these two should go through a strict test.
Air permeability tester will give you a great help.
Know more here: http://www.testextextile.com/product/auto-air-permeability-tester-tf164e/