Classic extensions are waterproof, comfortable, and safe. You choose the length of the lashes you want.  All products are Health Canada medical grade approved.  All extensions are vegan, cruelty-free.  The adhesive I use has low fumes and does not contain formaldehyde.  If your classics are not lasting the average 2 weeks, there are several reasons for poor retention: lashes are not cleaned daily, if you have oily skin, seasonal change (spring and fall), hormones, if you're using oil-based eye makeup, excessive sweating, or if you're taking certain medications.  You can keep getting fills for months to maintain your classic extensions.