Cyber Monday Free Shipping

HairBlock

Name: Cyber Monday Free Shipping
Brand: Missing In Action (MIA)
Availability: InStock

Outdoor-Proof Silky Barrier Serum

Lightweight serum that shields hair and scalp from sun, salt, chlorine, and cold weather

Free next day shipping + guaranteed 30-day returns

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Real people, real protection.

Ready to protect your next adventure? → Get HairBlock.

Science-Built. Adventure-Ready.

Formulated by chemists. Tested by outdoor adventurers.

CitroComplex is clinically shown to reduce 90% of hair damage — compared to 60% with standard formulas.

A powerhouse oil complex for protection + performance, blending Citropol® technology with plant-based oils to hydrate, smooth, and add shine — while boosting manageability and defending against UVA/UVB + heat damage.

Clean, Reef-Compliant UV Filters

Lightweight sun protection shields hair + scalp from UV exposure with no residue, no white cast, and no heaviness — even on dark hair.

Radish Seed Extract + Jojoba Oil

This moisture-locking duo absorbs fast to strengthen and smooth hair, boost shine, and protect against dryness, pollution, and cold-weather damage. Rich in antioxidants + fatty acids to keep your strands resilient in any climate.

How To HairBlock

HairBlock is your green light to live life outside — from high-energy adventures to low-key lounging. Whenever the elements are calling, MIA is your move.

As the last step of your styling routine, spray HairBlock into your hands at a safe distance.

Comb through, scrunch, or smooth onto hair and scalp — focus on the ends and any heavily exposed areas.

Swim, sweat, hike — do your thing. Similar to facial SPF, reapply every 40 to 80 minutes during extended sun or water exposure to keep your strands protected and glossy.

Frequently asked questions

HairBlock is packed with clean, high-performance ingredients that do the heavy lifting without the heaviness. We designed it to lock in moisture, fight breakage, boost shine, and create a silky, invisible shield between your strands and the elements.

HairBlock uses UV filters (Octocrylene, Avobenzone, and Ethylhexyl Salicylate) to further protect your hair from UVA and UVB exposure. We chose these high-performing chemical filters because they’re lightweight, leave no residue, and play nicely with textured hair - unlike some mineral-based alternatives that can leave a white cast or dry the hair out.

We chose UV filters that are reef-compliant and widely regarded as safer alternatives to banned actives like oxybenzone. Our formula is lightweight, effective, and designed with both your hair and lifestyle in mind - including time spent near the water. That said, we’re keeping a close eye on evolving research and are committed to continuous improvement as cleaner, reef-friendlier innovations become available.

Absolutely. HairBlock was designed to be part of your daily routine. It’s lightweight, non-greasy, and safe to use every day.

Yes! HairBlock is safe for color-treated and chemically-processed hair.

HairBlock has a light, floral plant-based fragrance that is subtle, clean scent, and fades gradually after application.

When we set out to create HairBlock, textured hair, (curls, coils, and waves) were at the center of every decision. But as we tested, learned, and received feedback, we realized something: all hair types need and benefit from clean, outdoor-forward protection for both hair and scalp.

HairBlock was made with textured hair in mind - but it works beautifully across the spectrum.