Timberland Cortina Valley Chelsea Boot For Women In Black Size 4. Our women's Cortina Valley Chelsea Boot is made of Premium Timberland® Leather and ReBOTL™ fabric containing at least 50% recycled polyester. Climb to new heights with pull-on style and dual stretch gore, plus an OrthoLite® footbed for comfort. A GreenStride™ midsole made from an EVA blend derived from at least 65% renewable materials sugarcane and rubber tapped from trees helps make this boot durable and made to last. Timberland supports responsible manufacturing of leather via the Leather Working Group.