Sigvaris 503C Knee-Hi 30-40mmHg Open Toe High Compression. Recommended for: CVI, Post DVT, Post-thrombotic syndrome, including: edema, hyperpigmentation, stasis dermatitis, stasis cellulitis, corona phlebectatica. venous stasis ulcers. Post trauma and fractures. Lymphedema. Long distance travel. Cosmetic coverage for unsightly leg blemishes. Irregularly shaped limbs. Post vein stripping, ligation, phlebectomy, and sclerotherapy of large veins.