In a nutshell, and as the word implies, It is placing multiple bio stimulating types of threads under your skin of your arms to entice your dermis and sub-dermis to generate much-needed new collagen and elastin (called neocollagenesis). Granted it’s not a panacea, but the safety and ability of PDO (polydioxanone) or PLLA (Poly L- Lactic Acid) biodegradable threads to generate collagen and elastin is well established in the medical literature for the past decades. These threads are placed superficially in the dermal layer, then pulled in an effort to tighten loose, wrinkled skin.