Men's NFL Sideline Official 39THIRTY Flex Hat - 2018 Sideline Fit

Our review of the New Era Men's NFL 2018 Sideline Official 39THIRTY Flex Hat finds it best for the fan who wants an authentic, performance-focused cap to wear to games or training sessions. The bottom line: this hat blends team authenticity with practical performance features, and the single biggest reason to buy is the HEX TECH performance fabric that keeps the head cooler during prolonged wear. The review compares fit, construction, and on-field styling to similar sideline caps and notes that it is an officially licensed piece designed and manufactured by New Era.

Key Features

• Official licensing: The hat is officially licensed by the NFL so fans get genuine team graphics and approved styling for sideline looks.
• Performance fabric: New Era's HEX TECH material provides improved cooling and moisture handling during warm-weather wear or active use.
• Adjustable strap: An adjustable fabric strap with slide buckle allows a more personalized fit for a range of head sizes without sacrificing a clean rear profile.
• Embroidered graphics: Raised, embroidered team details give the cap a high-quality, textured appearance that stands up to regular use.
• Manufactured by New Era: Construction consistency and long-term durability are supported by New Era design and production standards.

Who It's For

The hat is ideal for male fans who want an authentic sideline-style cap that performs during warm days or active events. It works well for game-day wear, tailgates, and casual training sessions where moisture management and a fitted look matter.

Those who prefer a rigid snapback, or who need a very large or very small fixed size may want to consider alternate cap styles; this flex hat is centered on a stretch-fit with an adjustable strap rather than a hard-structured, one-size-fits-all snap design.

Pros & Cons

Pros

• Official NFL licensing ensures authentic team branding and accurate sideline styling.
• HEX TECH performance fabric helps keep the head cooler during extended wear or activity.
• Raised embroidered graphics provide a premium look that resists fading from regular use.
• Adjustable fabric strap with slide buckle offers a clean, customizable fit for varied head sizes.

Cons

• The flex fit and adjustable strap may not suit users who prefer a fully rigid snapback silhouette or a fixed fitted cap size.

Specifications

Brand	New Era
Model	2018 NFL Sideline Official 39THIRTY
Licensing	Officially licensed by the NFL
Fabric	HEX TECH performance fabric
Closure	Adjustable fabric strap with slide buckle
Graphics	Embroidered with raised details

Our Verdict

This New Era 39THIRTY sideline flex hat is a smart pick for male fans who want authentic team styling with performance-minded fabric. It offers good value when you prioritize cooling material, embroidered detail, and an adjustable fit, though those seeking a rigid snapback silhouette should look elsewhere.

Frequently Asked Questions

Is this an official NFL product?
Yes, the hat is officially licensed by the NFL and manufactured by New Era.

Does the HEX TECH fabric actually help with heat?
HEX TECH is designed for cooling and moisture management, so it performs better than standard cotton in warm conditions.

How is the fit adjusted?
The hat uses an adjustable fabric strap with a slide buckle for a customizable fit alongside the flex construction.