arch4 – purethread
arch4
arch4, founded in London in 2017, approaches luxury with quiet intention—redefining modern cashmere through sustainability, craftsmanship, and understated sophistication. Each piece balances minimalism with warmth and structure with ease, crafted from responsibly sourced cashmere with a focus on timeless design and enduring quality. GOTS-certified and designed in Chelsea by a close-knit team, arch4 reflects a commitment to integrity, transparency, and a refined, conscious approach to modern dressing.
Our store
181 North Ferry Road, Second Floor, Suite C
Shelter Island Heights, New York
(631) 880 - 6420
Our Shelter Island boutique is open from March through September, with daily summer hours from Memorial Day through Labor Day. Current weekly hours are always available on Instagram.