Calvin Klein CK One Summer Eau de Toilette for him It's summer year round when you're wearing CK One Summer, an aromatic fragrance for both men and women that was released in 2004 by the house of Calvin Klein. This decadent and fruity unisex blend will have you recalling your favorite summer memories whenever you spritz it on. It features a top note combination of citrus and kiwi with a botanical heart of blueberry leaf and cactus, drying down to sultry musk base notes for an earthy finish.