In mathematics and numerical analysis, the Ricker wavelet, [1] Mexican hat wavelet, or Marr wavelet (for David Marr) [2][3] is the negative normalized second derivative of a Gaussian function, i.e., up to scale and normalization, the second Hermite function.

The Ricker by Bailey Western is a natural colored Marlboro crown with a simple 2ply brown band and spur pin. It features a wide venting pattern and Dri-Lex® sweatband to keep you cool and comfortable in the summer heat. Ricker is a Long Oval Marlboro crown.

The Ricker Hat is the perfect western look for spring and summer. The long oval Marlboro crown creates a dramatic profile. Explore your favorites at Hats.com.

Step into Western tradition with the Bailey Ricker Straw Cowboy Hat, a prime example of rugged elegance. Premium Straw Construction: Made from high-quality straw, this hat provides excellent breathability and durability, ideal for long summer days.

The Ricker by Bailey Western is a natural colored Marlboro crown with a simple 2ply brown band and spur pin. It features a wide venting pattern and Dri-Lex® sweatband to keep you cool and comfortable in the summer heat.

Buy Bailey Western Men's Ricker Cowboy Western Hat at Macy's today. FREE Shipping and Free Returns available, or buy online and pick-up in store!

The Ricker by Bailey Western is a natural colored Marlboro crown with a simple 2ply brown band and spur pin. It features a wide venting pattern and Dri-Lex® sweatband to keep you cool and comfortable in the summer heat.

The Ricker by Bailey Western is a natural colored Marlboro crown with a simple 2ply brown band and spur pin. It features a wide venting pattern and Dri-Lex® sweatband to keep you cool and comfortable in the summer heat. Ricker is a Long Oval Marlboro crown.

Made in Mexico Bailey presents their Ricker Bangora Straw Western Hat featuring a classic cattleman crown and flared wide brim. The Ricker boasts stylized venting along its crown, a two-ply grosgrain hat band with side ties, and Bailey side pin.