• Sustainable, healthy, high-performance loose-fill insulation for window and door jams.
• Box weight: 2 lbs.  Suitable for ~21 windows @36x60" with avg gap of 3/8-1".
• Best practice includes air-sealing with adhesive tape.
• Shipping is free

• Exceptional R-Value of 4.3 per inch
• Fast, easy and safe installation with no special protective clothing required.
• Class A rated for Fire Resistance and Smoke Development.
• Treated with boric acid to resist insects.
• Does not support the growth of mold.
• Proper air sealing is achieved with airtight adhesive tape

Simply stuff Havelock Wool inside all gaps around windows and doors. Proper air sealing is achieved with airtight adhesive tape.