Many listings label them suitable for all hair types; some product details specifically call out frizzy, normal, dry, or damaged hair.
Instructions recommend dispensing into the hands (pop‑open cap or one pump), then rubbing and applying from mid‑lengths to ends; some products specify application to damp hair.
At least one serum explicitly lists heat protection up to 450°F; other items describe protection from mechanical or environmental damage but do not specify a heat temperature.
Search results show single bottles such as 6 fl oz and 3.3 fl oz, and multi‑item sets presented as three 7 fl oz bottles (also listed as a 21 fl oz total).
Listings and reviewers commonly describe them as lightweight, fluid, and non‑greasy with a silky‑smooth finish that adds shine and softness.
Multi‑step sets are shown as three‑item kits that include shampoo, conditioner, and a leave‑in silk therapy treatment, often presented as three 7 fl oz bottles (listed as a 21 fl oz total).
Reviewer summaries report a range: several describe day‑long effectiveness, while a few note effects lasting several days or improving with long‑term repeat use.
