Anti-Mite Filling 400gsm. Cotton fabric 100%. Filling: Silicone recicled hollow fiber Dacron® Protect anti-mite, antibacteria and antifungal. Dacron Protect fiber provides air circulation and prevents the proliferation of mites, bacteria and fungi. Recommended for person with allergies. This model is available in the following weights: 250gsm (recommended for spring-summer), 400gsm (recommended for winter) and DUO 125 gsm + 250 gsm (two duvets that can be used separately or together all year round). For hygienic reasons this item cannot be exchanged or returned.