The national flag of the Czech Republic or flag of Czechia, or Czech Flag was adopted on 1 January 1993 (Czech Republic) and 30 March 1920 (Czechoslovakia). The red and white were almost identical to the flag of Poland, and a blue triangle was introduced in 1920. Crew Cut Socks Get ready to jump, run, ride, play and be epic with Sox Footwear’s premium crew cut socks. Gone are the days of wearing the same old-school cotton socks built for “comfort” and not performance. Our new technology enhances your sock game, with breathable upper mesh, reinforced heel and toe, and soft PolyLon36 material that makes you feel like you’re walking on air. View the product care instruction here. For an in-depth description of our technology, click here.