RESIN COATED STEEL - This elegantly designed above ground pool features a super strong steel wall that has been hot dip galvanized for protection. The copper bearing steel wall is resin coated both on the inside and outside offering great protection against premature rusting while offering maximum longevity..PRETTY PLEASING PATTERN - The Coastal Rock liner print provides a shimmering cool appearance to any swimming pool. The North American cut material is hand-folded to prevent permanent creasing and excess wrinkling. Before installing, lay the liner out in the sun for a minimum of one hour to warm up the vinyl ensuring it is able to stretch when adding water. The best temperatures to install would be between 70-80 degrees..ALL YEAR READY – The Riviera above ground swimming pool is designed to remain in place all year round. It offers easy one-time installation as all parts are made specifically for this 21’ round pool as a result of exact-fit components that lock out corrosion. Interlocking stabilizer rails and coping strips fit tightly over your liner and the top of the pool wall locking the coastal rock liner in place..SAY HELLO TO SUMMER - Why miss out on the fun this summer, when you could be the center of it all? Owning a swimming pool can enhance family time, promote fitness, and it is a social magnet! Your family and friends will be begging to come over. This All-American made pool makes for the ideal gathering place to stay cool.