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You want body from sunup to sunset.

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The challenge: High temps and humid air can deflate your style.

New formulations are lightweight and contain ingredients that expand the diameter of each strand.

These components also add a positive charge that reacts with hair’s negative charge, says Dr. Fusco.

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The result: Strands repel one another, creating more space between them and, hence, more oomph.

Bonus TipDon’t drop a huge dollop of mousse on top of your head.

Use a wide-toothed comb to spread it out completely.

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Sun SafeProtect strands from UV rays with a spritz of Living Proof Restore Instant Protection, $26.

Bra, Norma Kamali, $175;Shop.NormaKamali.com

Strong, healthy tresses are undeniably beautiful.

But too much sun exposure can cause little tears along the cuticle layer, which may weaken strands.

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“Squeeze the water out of your hair before applying, so it doesn’t dilute it.

Rinse after a few minutes,” Scrivo says.

“Read email, eat breakfast.

The Heat Is OnSoak up sweat and oil with Toni & Guy Cleanse Dry Shampoo, $15.

You don’t just want your hair to look good, you want it tofeelgood, too.

Your strands' fatty-acid layer, the outermost barrier, is key to touchable hair.

Quick FixA hair oil (try Aveda Dry Remedy Daily Moisturizing Oil, $27).

Natural oilsargan, sesame, avocadosoak deep into the hair shaft.

“They keep hair hydrated longer than products that just coat it with conditioners,” Scrivo says.

Before bed, distribute a tablespoon or two through dry hair.

“Water and oil don’t mix, so wet hair can block absorption,” Scrivo explains.

Shampoo clean in the morning.

Repeat the process each time you wash until hair feels softer.

Bonus TipIf hair is extra dry, try a leave-in conditioning spray with dimethicone in addition to the oil.

Tank;Cosabella.comfor similar styles.

Bikini top, $21;VictoriasSecret.com.

A windy day at the beach or everyday styling can rough it up and leave hair dull.

Applied to damp hair, Kerastase Discipline Maskeratine, $63, leaves strands frizz-free and shiny.

Quick FixAn at-home gloss (we like Ouidad Color Sense Shine Boosting Color Extender, $26).

Apply one to damp hair for 10 minutes, then rinse.

Think of it as a shiny topcoat for your strands.

Bonus TipTo play it safe, use a gloss only every few months.

“Some contain a small amount of peroxide, which can be damaging if overused,” Scrivo says.

Shorts, Elisabetta Rogiani, $68;Rogiani.com

Styling, Lida Moore Musso.

Photo Credit: Arthur Belebeau