Number 4 Hydrating Shampoo 25 oz — Sulfate-Free Moisturizing, Color-Protecting Cleanse for Dry or Sensitive Scalps

Number 4 Hydrating Shampoo is a sulfate-, gluten- and paraben-free moisturizing shampoo that gently cleanses, soothes dry scalps and helps preserve color for softer, shinier hair.

This hydrating shampoo from Number 4 is formulated to replenish moisture, improve manageability and protect color-treated hair without harsh sulfates or parabens. Its balanced cleansing action removes buildup while leaving natural oils intact, so hair feels softer and looks glossier after repeated use. Ideal for daily or occasional washes, the formula is suited to sensitive scalps and hair that needs extra hydration or color longevity. Available in a full-size 25 oz bottle and a travel-friendly 1.5 oz option, it fits both home routines and on-the-go kits.

How does this shampoo hydrate hair without weighing it down?

The formula targets dryness with lightweight emollients that attract and lock in moisture without coating strands. It smooths the hair cuticle for improved shine while maintaining natural movement and volume. Conditioning agents are balanced so hair feels nourished rather than heavy.

• Moisture-rich ingredients designed to restore softness from root to tip
• Lightweight conditioning to preserve natural body and bounce
• Cuticle-smoothing agents for enhanced shine and manageability

Will Number 4 Hydrating Shampoo help protect my color-treated hair?

Yes — the shampoo cleanses gently while helping minimize premature fading. Without sulfates, it avoids the aggressive detergents that can strip color molecules and natural oils. Regular use supports vibrancy and extends time between salon color refreshes when paired with a color-protecting conditioner.

• Sulfate-free cleansing reduces color-stripping during wash
• Formulated to maintain vibrancy and reduce fading
• Works best with a matching moisturizing conditioner for complete care

Is this shampoo suitable for dry or flaky scalps?

The hydrating formula soothes and refreshes dry, flaky scalps without irritation or residue. Gentle surfactants and moisturizing components help reduce tightness and flakiness while promoting a comfortable clean feeling. It’s a good option for sensitive scalps that need relief but cannot tolerate harsh ingredients.

• Soothes dryness without buildup or heavy oils
• Gentle on sensitive skin and non-irritating cleansers
• Leaves scalp feeling refreshed and hydrated

How portable is this shampoo for travel or gym use?

Number 4 Hydrating Shampoo comes in both a generous 25 oz size for home use and a compact 1.5 oz travel bottle ideal for carry-ons, gym bags or sample kits. The smaller bottle meets most airline regulations and is convenient for short trips or trial use. The travel format offers the same sulfate-free, moisturizing benefits in a pocketable package.

• Full-size 25 oz bottle for long-term use at home
• 1.5 oz travel bottle fits carry-on and toiletries easily
• Consistent formula across sizes for identical performance

Who is this for? Number 4 Hydrating Shampoo is designed for anyone seeking a daily or frequent-use cleanser that prioritizes moisture, color longevity and scalp comfort. Choose it if you have dry, brittle, color-treated or sensitive hair and want a sulfate-, gluten- and paraben-free option. It’s also a solid pick for travelers who want salon-grade care in both full and travel sizes.