39 x Permavent Leto 125 Breathable Felt 1.0 x 50m (125gsm).
 
Manufactured by Permavent, the latest LETO range of breather membranes delivers reliable protection for both warm, non-ventilated and cold, ventilated roof systems. Its advanced three-layer construction combines two layers of non-woven polypropylene with a microporous film to create a highly breathable, waterproof membrane. Designed to regulate humidity and moisture, LETO helps minimise condensation and contributes to a healthier, more durable building envelope.