Merrell's Siren 4 Thermo Chelsea WP is a women's winter boot that combines waterproof protection with thermal insulation to keep feet dry and warm in cold, wet conditions. The Chelsea pull-on design allows for quick entry without laces. Waterproof (WP) to guard against moisture Thermo insulation for added warmth in winter Chelsea-style silhouette for easy on-and-off wear Women's boot suited for fall and winter seasons Part of Merrell's Siren 4 product line