What it is: A silicone-free mask that revives dull and lifeless fine to medium hair, providing up to 72 hours of locked-in hydration for healthier, shinier hair.* Hair Type: Straight, Wavy, and Curly Hair Texture: Fine and Medium Hair Concerns:- Dryness- Shine- Damage, Split Ends, and Breakage Key Benefits: - Reduce breakage by up to 90%**- 72-hour hydration lock*- Supports healthier hair over time​ Highlighted Ingredients:- Hemisqualane: Smooths the cuticle, leaving hair silky and shiny.- Murumuru Butter: Softens hair and enhances shine.- Amino Acid Blend: Increases hair's hydrophobicity to lock in moisture. Ingredient Callouts: Free of parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, sulfates SLS & SLES, triclocarban, triclosan, and contains less than one percent synthetic fragrance. It is also vegan, cruelty-free, and comes in recyclable packaging. What Else You Need to Know: This lightweight mask is designed to rehydrate fine hair without any heavy silicones to weigh strands down. It features a biomimetic emollient blend that smooths and aligns individual hair fibers to boost overall shine, softness, and manageability. *When used with PhD Shampoo**After 1 use of Perfect Hair Day™ Weightless Mask vs. untreated Clinical Results: Based on a 50-person, 2-week home use test:- 97% of consumers agree Perfect Hair Day Weightless Hydrating Mask polishes and protects hair- 95% of consumers agree Perfect Hair Day Weightless Hydrating Mask makes hair look healthier- 95% of consumers agree Perfect Hair Day Weightless Hydrating Mask leaves hair more hydrated Clean at Sephora is our commitment to offering effective products without certain ingredients, such as parabens, sulfates, phthalates, and mineral oils. Learn more here.