This shell fits perfectly to Cubot One, color especially to the Red. The envelope is provided for the Cubot One when the Cubot cover (back cover) is not mounted. With back cover, it does not fit. But yes you can buy an envelope to the back cover not to have to use,
The material is very soft and cuddly. The flap has a velcro, and pulls the phone out of the case when one takes off.