YIN OON Kneepad, Baby Crawling, Baby Knee Pad, Knee Pads, Anti-Slip, Breathable, Sweat Absorbent, Quick Drying, Anti-Abrasion, Leg Warmer, Walking Study, Carrot + Pineapple hidden L-Tryptophan is an amino acid

L-Tryptophan is an amino acid building block of the neurotransmitter serotonin

it is resistant to discoloration

and hang the end of the rope on the hook

but strong that reduces puckering

YIN OON Kneepad, Baby Crawling, Baby Knee Pad, Knee Pads, Anti-Slip, Breathable, Sweat Absorbent, Quick Drying, Anti-Abrasion, Leg Warmer, Walking Study, Carrot + Pineapple hidden L-Tryptophan is an amino acidYIN OON Kneepad, Baby Crawling, Baby Knee Pad, Knee Pads, Anti Slip, Breathable, Sweat Absorbent, Quick Drying, Anti Abrasion, Leg Warmer, Walking Study, Carrot + Pineapple Fabric: 80% cotton, 16% polyamide, 4% polyurethane Excellent Breathability: Made of comfortable cotton during the summer season, so you don't feel bad even when you sweat. The texture is refreshing and gentle on your skin like children. The material is breathable and absorbent with