Although unquestionably influenced by WW2 German camouflage designs such as Splittermuster (splinter pattern) and Sumpfmuster (marsh pattern), it was Poland that fielded the first design that has come to be known as "rain" pattern. This design series is known officially as the wz58 Deszczyk (raindrop). Distinguished from the WW2 designs by the simplicity of incorporating only densely concentrated lines or "rain straits" over a solid-colored field, the design actually has limited functionality as camouflage and from a distance probably serves no greater purpose than would a solid-colored uniform. Nevertheless, several other countries in the Warsaw Pact developed their own versions of the rain pattern, (most notably East Germany), and a number of insurgent movements are known to have utilized the patterns over the years. The original Polish design is a heavy pattern of dark brown rain straits on a brownish-green or blue-grey background (two variants are documented, often referred to as "brown" and "grey" variations). Although the rain straits are generally thinner than those found in patterns from other Warsaw Pact nations, some versions with thick rain straits have also been documented.