Thicker shade fabric doesn't necessarily mean better sun protection. The key lies in the fabric density and the fiber coating's ability to physically reflect and absorb ultraviolet (UVA/UVB) wavelengths.
Professional testing shows that ordinary cotton and linen fabrics offer about 40%-60% light blocking, while thicker, denser-woven shade fabrics with UV-resistant surface treatments can achieve over 85% visible light blocking while blocking over 90% of harmful ultraviolet rays. This is due to the "optical barrier" effect determined by the warp and weft intersection angle, single-filament diameter, and the number of yarns per unit area, not simply by color depth or weight. For long-term exposure scenarios such as sunrooms, west-facing balconies, and terrace relaxation areas, what's truly needed are structurally stable, highly reflective of heat radiation, and breathable, non-suffocating composite shade materials.
