ZY Hats › MONA HAT Image 1 of 3 Image 2 of 3 Image 3 of 3 MONA HAT €530.00 The MONA HAT. Brown felt. ZY silhouette. Simple, strong, and forever in style. Size: S-M (54-57) M-L (57-60) Quantity: Add To Cart Added! The MONA HAT. Brown felt. ZY silhouette. Simple, strong, and forever in style.