Summer Grosvenor Blue Flat Cap

Our bestselling traditional flat cap is ready for the spring and summer season.

This elegant but understated luxurious linen cap with a flattering fit has been re-imagined in a light blue weave that looks and feels effortlessly cool.

Summer Grosvenor Blue Flat Cap
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Peak length: 5 cm, Diameter: 24 cm


This hat is not designed to be worn in the rain. Should you get this style wet, it should be dried at room temperature, never on top of a radiator.


Made in Belgium, the Summer Grosvenor blue flat cap is lightweight, durable, and soft to the touch. It has a cotton lining and a sweatband to keep it in place.

Styling & Fitting

The Summer Grosvenor is a contemporary classic that is ideal for the trend-conscious urban gentleman.

Men's Hat Styling

Every Lock & Co. hat purchased is carefully and expertly hand-prepared in our London shop by one of our Hatters, before being whisked out of our famous green front door.

To find your perfect hat size, we suggest booking a virtual appointment for a consultation with one of our hatters here.


At Lock & Co., we sell the finest hats and caps. To achieve this, we pay particular attention to specific hat characteristics - style, fit, durability, and materials. We share these characteristics with you for each hat to help you decide on the perfect choice.

Find Your Size and Style

Flat Cap
At Lock & Co. we offer a wide selection of styles of hats. What defines a hat style is its form: overall shape, height/shape of the crown, width of the brim, and material type. These define a style e.g., Fedora, Trilby, Panama, Cloche, Tweed cap etc.
Lock & Co. hats are made of the finest quality material. These can range from exclusive Escorial wool, Scottish Tweed, and cashmere to Toquilla straw for our Panama hat.
Narrow Shape
Different styles of hats have different shapes to them, including classic, fuller, narrow, and standard fits, or with an oversized or a wide brim or sporting a particular shape - bell, birdcage, etc.
Lightweight Breathable
Every part of a hat has its purpose. Discover the features or aesthetic of each hat and how it will specifically enhance your hat-wearing experience.