The Kerroin dress is made of organic cotton twill, and it has a slim, A-line fit. The product contains 4% elastane. The dress features the Siluetti pattern, which is printed in Helsinki. The dress has an O-neck, a concealed zipper with a long grosgrain ribbon puller in the back seam, and side seam pockets. The long sleeves have darts at the cuffs that give the sleeves a round shape. The dress has belt loops in the back and it comes with a narrow, separate belt.

The Siluetti (silhouette) pattern depicts how the colors of the sky and sea melt into each other on the horizon. Carina Seth Andersson painted the thin, irregular stripes in varying hues with long strokes of a stiff brush.