What are Jamberry nails?! Jams are heat-activated vinyl nail wraps. They’re unlike anything else you can buy anywhere else. They’re not polish strips. They outlast the dollar-store brands and even the expensive salon brands. They don’t chip, fade, smudge or smell — and they don’t dry out or expire. Jamberry nail wraps last up to 2 weeks on your fingers and up to 6 weeks on your toes.