For reference:My son is 26 months old, but petite…he was a 26 weeker micropreemie. He is 23 lbs, 30” tall and wears 12m clothing. We bought the SMALL.Very adjustable and will fit for years to come!!!NO annoying tags or rough edges!NOT hot! Very breathable!My son has developmental delays and issues with sensory processing, emotional regulation, and overstimulation (common for a micropreemie that’s now a toddler). He also has a speech delay; he says 2 words - “dada” and “ba(ll)”. He is cognitively intact, going through a developmental spurt, experiencing change such as moving into a big boy bed, and has a lot to “say” but he can’t actually communicate beyond two words and two signs. Frustration can go from 0 to 100 FAST.He is not autistic. Maybe ADHD (he exhibits signs and is very high risk given his extreme prematurity but it is hard to tell this young).His developmental pediatrician at the NICU follow-up clinic first mentioned a vest to me. Then our OT said a compression vest might help with his focus. Then our PT suggested “weight work” or a weighted vest to help slow him down and provide sensory input.So I spent a night reading and researching, eventually deciding on the Harkla weighted compression vest.Wow. I notice an immediate difference. He can actually focus longer and doesn’t get frustrated as easily. He can self-regulate better.We wear it daily during focused developmental play, and often to his doctor appointments. We leave it on ~20-30 minutes at a time and limit use to an hour or less per day total.I have no basis or comparison but people who do have commented favorably.His speech therapist asked me to send her a link to it.His PT wanted to know the brand, and commented on how it was superior to some of her other patients’ vests… easier to put on, secure, easy weight adjustment options, very sturdy weight bags, and how he doesn’t get overheated at all (we live in Arizona, this is huge).His OT knew it the moment she saw it…”Harkla is the best, but not cheap.”His normal pediatrician commented on how he didn’t realize they made therapeutic ones that could fit a child of my son’s size (he may be 26 months but wears 12 month clothing and this is able to be fitted to him very securely).I am very pleased with the usability, helpfulness, and quality. My son tolerates it just fine. It seems costly for neoprene, Velcro, and mesh… but isn’t everything expensive now?