The Project Four always comes with the same round resin case, 41 millimetres across and ten thick, acrylic glass, an analogue display and 5 ATM. What changes from one reference to the next is colour, and here it moves between black, white, green, blue and rose gold, always with a matching plastic or polyurethane strap. Against the Project Two it gains three millimetres of diameter; and against the Project Four Solar, which shares those 41 millimetres but goes up to 10 ATM, the movement stays quartz. It is a line you pick by colour before you pick it by function. Adidas is one of the brands for which we are an authorised official distributor.