For any given substance, the heat capacity of a body is directly proportional to the amount of substance it contains (measured in terms of mass or moles or volume). Doubling the amount of substance in a body doubles its heat capacity, etc.
Conventional soft contacts can last up to a year; conventional rigid gas permeable (RGP) contact lenses can last even longer. Frequent or planned replacement contact lenses last one to several months. Disposable contacts last from one day (daily wear) to up to two weeks (extended wear).
According to a new FDA approved claim, 1-DAY ACUVUE MOIST Contact Lenses worn daily may provide improved comfort for people with mild allergic discomfort and eye itching. Each box contains 90 soft daily disposable contacts in buffered saline solution. 42% polymer (etafilcon A) 58% Water.