1. a specially shaped edge provides wind-resistance
2. mounting holes to make installation easier
3. surface structure imitating natural wood
4. atractive look - colours and grain patterns perfectly imitate original wood

The resistance of the material the vinyl siding is made of significantly exceeds the resistance of its wooden prototype while retaining the appearance (wood-imitating imprint). Resistance to changing atmospheric conditions (humidity, low and high temperatures, solar radiation, wind), biological agents (insects, moulds) and most chemicals ensures many years of trouble-free use. The durability of the facade is also ensured by the structure of the panels itself – the specially profiled edge at the mounting holes further blocks the fixing screws. Such a design, referred to as "hurricane-proof", protects the panel from detaching from the building’s wall even during very strong winds. Studies conducted by independent institutes* show that the use of vinyl siding (as well as other types of polymer facades) due to its very long period of use, ease of transport and full recyclability has a much less negative impact on the environment than the use of such materials as wood or brick. 

*National Association of Home Builders http://www.nahb.org/
U.S. Green Building Council http://www.usgbc.org/